As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD CABIN EMERGENCY LIGHTS COME ON FOR A FEW MINUTES THEN GO OUT FOR AWHILE AND THEN COME BACK ON FOR A FEW MINUTES, REPEATEDLY. REMOVED BOTH EMERGENCY BATTERY PACKS AND INSTALL OPERATOR SUPPLIED BATTERY PACKS PER AMM 33-52-01. ALL OPS CHECKS GOOD, NO FURTHER DEFECTS NOTED.