As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSENGER CABIN, EMERGENCY LIGHTS BATTERY PACK M1673 FAILS OPERATIONAL CHECK. REMOVED AND INSTALLED NEW BATTERY PACK POS M1673 AT AFTER ATTEND ANT AREA CEILING PANEL LH IAW AMM 33-51-06-960-805 STEP 4.E .(1) UP TO 4.E.(5). (B). AND AMM 33-51-06-960-805 4.E.(6). UP TO 4.E(7). (B).1). AND PERFORMED EMERGENCY LIGHTS OPERATIONAL TEST IAW B737 AMM 33-51-00-720-801 STEP 3.D.(1) UP TO 3.D.(4). (B). OPS TEST GOOD.