As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L1 EXTERIOR AND R1 INTERIOR EMERGENCY LIHTS FAIL OPS CHECK DURING SERVICE CHECK. REF TO PEMCO NR 1861.0028 REPLACED ATTERY PACK AT M1674, LOCATION IAW B737 AMM 33-51-06-96 0-805. PERFORMED OPS CHECK OF EMERGENCY LIGHTS IAW B737 MM 33-51 -00-710-801. OP CHECK GOOD.