As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ACCOMPLISHMENT OF TASK-CARD 767-33-033-01 EMERGENCY LIGHT POWER SUPPLIES ON C-CHECK 1C/2C/S1C/S2C ALL BATTERY PACKS FAILED THE CAPACITY CHECK AND RT EXTERIOR LIGHTS ABOVE THE R-4 DOOR AND BOTH AFT WING SLIDE LIGHT FAILED TO ILLUMINATE. REMOVED AND REPLACED ALL BATTERY PACKS PER AMM 33-51-07, RE-TESTED SYSTEM, OPS CHECK GOOD.