Another CL Receiver Question

CL was working one minute then not. It’s getting 12v. Nancom says no signal received off fob but I know it’s not this as I have two fobs and neither registering. Central Locking is working off the actuator. My question is this. Is it definitely the receiver or could it be the BCU ? If it might be BCU how can I tell the difference if that makes sense !

The only simple and certain way to rule it out is to replace the receiver with new or 100% good one as it's plug and play and if no joy then suspect the BCU or a wiring issue, usually a BCU fault would not affect ONLY the RF function

Thanks that’s what I was thinking. Appreciate the advice.