As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING T/C # 78233001, LT & RT AFT OVERWING EXIT EMERGENCY LIGHT (EXTERIOR). LIGHT WENT OUT BEFORE TIME LIMIT. ACFT GROUNDED. REPLACED THE POWER SUPPLY BATTERY PACKS M1670 AND M1671 IAW AMM 33-51-06-960-805, OPS CHECKED GOOD.