We have tried two ebay vendors, one twice, them sending out the same non-working ECM sent previously. Indications are most vendors pull from boneyards and stuff on ebay, hoping they work, with no testing. Some at least call them 'cores'. Looking now(me at least) for someone who is willing to take a look at the original or the spare, non-working one in my basement. I thought bad caps, but all check OK as far as ESR.