Does anyone have a Transmission Control Module, Part number 24256861, for a GMC Sierra 2500HD SLT, 6.6L Duramax/ Allison tranny? I've looked all over and cannot locate one, except on eBay for $4995 (for a roughly $700 item.) That amounts to usury. I know, I know, the law of supply and demand. Seems GM really dropped the ball on making a goodly supply of this part. Any help would be appreciated. Thanks, Dave