As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS, BATTERY PACK M1675 FAILS CAPACITY CHECK (REF. AAR NR 1000037601). FAILED FUNCTIONAL CHECK DURING C CHECK IN RFD. REMOVED AND INSTALLED BATTERY PACK M1675 LH SIDE IAW B737 AMM 33 -51-06-960-805 STEP 4E(5) TO 4F, OP CHECKS GOOD.