As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTING SYSTEM NOT WORKING PROPERLY. WITH SWITCH IN ARM, EXTERIOR LIGHTS ILLUMINATE AND BACK HALF OF CABIN LIGHTS ILLUMINATE. FOUND 5G SWITCH ACTIVATED. REPLACED AFT BATTERY PACK DUE TO SW BEING TO SENSITIVE. OPS OK IAW CE750 M/M 33-50-01.