As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON PREFLIGHT WHILE CONDUCTING EMERGENCY LIGHT TEST FOUND EXIT SIGNS FLANKING MAIN CABIN DOOR NOT ILLUMINATED WHEN SWITCH PLACED IN ON. WHEN SWITCH PLACED IN ARM ALL OTHER LIGHTS EXTINGUISH. REMOVED AND REPLACED EMERGENCY LIGHTING BATTERY PACK ONE IAW MM35-50-06. OPS CK GOOD.