As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TESTING FOUND EMERGENCY LIGHTS REMAIN ON WHEN COCKPIT LIGHT SWITCH IS IN OFF POSITION. MAINTENANCE FOUND BAD SWITCH AT LAV D MODULE M1418. R & R SWITCH, REF WDM 33-51-11. NOW OPS NORMAL. ALSO, FOUND AFT BATTERY PACK M1676 INOPERATIVE. R & R SAME REF B737 33-51.