As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN EMERGENCY LIGHTS CAME ON UNCOMMANDED IN FLIGHT PASSING THRU 33000', REMAINED ON, UNTIL CYCLED THE EMERGENCY LT SWITCH. R & R COCKPIT EMERGENCY LIGHT, PASS OXY SWITCH PANEL IAW AMM 33-51. NO HELP. R & R FIRST CLASS BATTERY PACK AND CHARGER M730. NO HELP 866781. FOUND CHARGER M730 BAD FROM STOCK. REINSTALLED ORIGINAL CHARGER REF AMM 33-51. SYS OPS CKS NORMAL.