As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1137, BOS-DTW. SMOKE REPORTED IN CABIN DURING FLIGHT BY INFLIGHT. FIRST NOTICE IN MID CABIN AND OBSERVED TO BE ELECTRICAL SMELL. AFTER DURING QRH AND DUMPING PRESSURIZATION SMOKE CLEARED AND DID NOT RETURN; PERFORMED FIM TASK 21-20-00-810-801-A FOUND SMOKE TO BE CAUSED BY THE # 2 ACM FAILURE. COMPLETED INSPECTION WITH NO OTHER FINDINGS. SEE DEFECT # 2671815 # 2 ACM FAIL. SUPPLEMENTAL INFORMATION TO FOLLOW.