As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM DUE TO AFTER ENGS START, THE CB P18-3 POS A11 WAS POPPED & AN ELEC CABLE BURNED ODOR WITH NO EVIDENCE OF SMOKE. DURING REVISION, THE EMER LIGHTS BATTERY PACK NR M1674 WAS FOUND BURNED. THE EMER LIGHTS BATTERY PACKS NR M1674 & M1675 WERE REPLACED IAW AMM 33-51-06, TESTED CORRECT.