As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: MULTIPLE EMERGENCY LIGHTS ARE OUT. SUSPECT BATTERY POWER SUPPLYTO BE BAD. REMOVED AND REPLACED 9RH BATTERY PACK. PER B737-NG-AMM 33-51-06 AND PERFORMED SATISFACTORY OPERATIONAL TEST OF EMERGENCY LIGHTS, PER B737NG AMM 33-51-00.