As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS IN CABIN ARE OUT FROM OVERWING DOORS FORWARD. GROUNDED - YES. OPENED FOUR BATTERY PACK ACCESS PANELS AND REPLACED BATTTERY PACKS OPS CHECK GOOD AND CLOSED ACCESS PANELS IAW B737-900 AMM 33-51-06-960-805. (S/N 138291, 138372, 428810, 428814)