Well, I've pretty much gave up on trying to figure out the problem component (already ruined one of my BCG's while trying to replace the cap. Still didn't work). The first time I went to RS to get an Xmod, I asked if they had any returned xmods I could buy, but the guy said nobody ever returned any xmods and even If they did, then I wouldn't be able to buy it. I guess this RS follows the rules
So, instead, I looked at the xmod exploded view (found elsewhere in this forum, in the Parts and hop-ups) and found the part number for the circuit board, and searched for and found the parts list... I'll go to RS as soon as I can and just order a new pcb.