As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHT SIGN AT 19A AND EMERGENCY LIGHT STRIP, BY LT MID LAV CAME ON FOR ABOUT 30 MIN IN FLT THEN FLICKERED AND WENT OUT. DISCONNECT AND RECONNECTED EMERGENCY BATTERY PACK PER MM AND TESTED PER MM. ACP FIM 33-51-00-108 SYS PASSED OK, NO FAULTS FOUND. REPLACED DOUBLE BATTERY AND SINGLE BATTERY PACKS, FOUND CONNECTORS DIRTY, ALSO CLEANED CONNECTORS. OP CHECKS GOOD ON GROUND CHECKS.