The usual intital fault was warm fridge. I cleared a blocked condensor and replaced both thermistors. Both evap and cond fans ok, defrost heaters and fuse ok. Also checked the baffle is functioning.
Cust ran defrost and had worked fine for around 2 weeks, now its come back the fridge is colder but not cold enough!
If the yellow thermistor is on a plastic clip, remove and cable tie to the pipe.
This can “get around” a comp that has overheated and is now slow to get down to temp. Prob not the pcb.