diff --git a/APSCT_I2C.py b/APSCT_I2C.py
index f9625dfdb42c18cb1c00eca1400e5c0f640f4dfb..4e10741eadd811dbd97ea5c2d3668a9104c9c918 100644
--- a/APSCT_I2C.py
+++ b/APSCT_I2C.py
@@ -63,8 +63,10 @@ EEPROM = 0x50
 #
 # I2C switch addresses
 #
-i2c_switch_addr = [0x70, 0x71, 0x72, 0x73]
-
+i2c_switch_addr_rcu = [0x70, 0x71, 0x72, 0x73]
+i2c_bus_rcu = 1
+i2c_switch_addr_unb = [0x70]
+i2c_bus_unb = 3
 
 #
 # ID Pins 
diff --git a/apsct_lib.py b/apsct_lib.py
index eee2b32dedc42b59b37c926164b6b69d0165af4a..0b2d17d8c39c6c47d7394368017499dc518d631d 100644
--- a/apsct_lib.py
+++ b/apsct_lib.py
@@ -43,8 +43,10 @@ class ApsctClass:
         self.sensors = ApsctSensors()
         self.pps = PpsClass()
         self.i2cswitch = []
-        for addr in APSCT_I2C.i2c_switch_addr:
-            self.i2cswitch.append(I2cSwitch(address=addr))
+        for addr in APSCT_I2C.i2c_switch_addr_rcu:
+            self.i2cswitch.append(I2cSwitch(address=addr, bus=APSCT_I2C.i2c_bus_rcu))
+        for addr in APSCT_I2C.i2c_switch_addr_unb:
+            self.i2cswitch.append(I2cSwitch(address=addr, bus=APSCT_I2C.i2c_bus_unb))
         self.apsct_id = ApsctId()
 
     def read_IO_expanderis(self):
@@ -206,7 +208,9 @@ class PllClass:
         print(f"Setup PPL {self.frequency}")
         self.dev_i2c_pll.write_bytes(0x07, 0x00)
         if self.frequency == '160MHz':
-            self.dev_i2c_pll.write_bytes(0x03, 0x08)
+            i2c_address = APSCT_I2C.PLL_200M
+            dev_i2c_pll_sel = I2C(i2c_address, BUSNR=I2CBUSNR)
+            dev_i2c_pll_sel.write_bytes(0x03, 0x08)
         else:
             self.dev_i2c_pll.write_bytes(0x03, 0x28)
         self.Write_byte_PLL(0x03, 0x0C)
@@ -261,6 +265,7 @@ class PllClass:
             stri = f"PLL {self.frequency} Not locked --> PLL Error"
         if PRINT_ON:
             print(stri)
+        return self.lock
 
     def read_lol(self):
         #
@@ -504,16 +509,17 @@ class I2cSwitch:
     #
     # Class to check a I2C-switch 
     #
-    def __init__(self, address=0x70):
+    def __init__(self, address=0x70, bus=1):
         #
         # Whats needed to measure the toggle on GPIO24
         #
         self.address = address
+        self.bus = bus
         self.dev_i2c_switch = I2C(address)
-        self.dev_i2c_switch.bus_nr = 1
+        self.dev_i2c_switch.bus_nr = bus
 
     def check_switch(self, data=0xa5):
-        print(f"Check I2C switch at 0x{self.address:x}", end=' ')
+        print(f"Check I2C switch at 0x{self.address:x} bus {self.bus}", end=' ')
         ret_ack, ret_value = self.dev_i2c_switch.read_bytes(0)
         if ret_ack < 1:
             print("I2C-Switch not found")
diff --git a/production_apsct.py b/production_apsct.py
index 87517130d2248702a22c415f1fa4f650570dcd7b..c45becb4bc006b6dc901ef42d7bd5e3d7501f2c0 100644
--- a/production_apsct.py
+++ b/production_apsct.py
@@ -34,9 +34,9 @@ for mode in modi:
     apsct.frequency = mode
     apsct.set_apsct()
     if mode == "200MHz":
-        apsct.pll_200.read_lock()
+        state = state & apsct.pll_200.read_lock()
     if mode == "160MHz":
-        apsct.pll_160.read_lock()
+        state = state & apsct.pll_160.read_lock()
 
 apsct.frequency = "200MHz"
 apsct.set_apsct()
@@ -57,3 +57,5 @@ if state:
         rw_ok = apsct.eeprom.wr_rd_eeprom(serial, address=0x20)
     if not rw_ok:
         print("EEPROM Error")
+else:
+    print("\n >>> Errors during testing <<<\n")