Going completely blind, I'd guess something wasn't torqued correctly after your engine rebuild. I'm assuming they pulled the motor for the rebuild. Could be a myriad of things, but the shop that did the rebuild should be the one answering this question for you. I doubt a tiny bit of wheel rotation while in Park would destroy your tranny.
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2011 Space Grey 135i DCT:
Pure Stage 2, Fuel-it Stage 2 LPFP, ST XTA Coilovers, Berk Street Axle Back, MHD Stage 2+, VRSF Catless DP, VRSF 5" FMIC, VRSF LCP, BMS UCP, M3 FSB, e92 M3 Drivers Seat.
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