As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 387, BOS-SEA. RETURNED BACK TO BOS, EMERGENCY EXITS CONTINUALLY FLASHED IN FLIGHT. TRIED SEVERAL CONFIGURATIONS WITH MAINTENANCE CONTROL AND COULD NOT FIX THE ISSUES ; FOLLOWED TSM 33-51-00 REPLACED RELAY 8WL PER ASM 33-51-00 ALSO REPLACED CIDS DRECTOR 1 FPR PRECAUTION REF AMM 23-73-34 OPS CHECK OK