Thanks for your very comprehensive and helpful reply which confirms our thoughts about not shelling out a load of money on a new pcb in case it gets fried, because the fault lies elsewhere. Will check again for anything that resembles a fuse downstream from the line feed (have not seen one so far) and try to post a photo. I think these units have a hard life, as one compressor serves two evaporators but I'm no expert. May try to salvage some parts for future projects before it goes to the dump. Many thanks again.
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