As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS FROM OVERWING EXITS AFT WILL ONLY ILLUMINATE WHEN POWER IS TURNED OFF. AFTER FURTHER TROUBLESHOOTING, FOUND PIN N AT OVERHEAD BIN CONNECTOR P5418 PUSHED BACK AND NOT LOCKED IN. (ARM DISABLE LINE FOR BATTERY PACKS #3 & #4). FULLY SEATED CONTACT N AT CONN P5418 AND SECURED AS NEEDED IAW CRJ 900 ESPM 20-26-00. EMERGENCY LIGHTS OPS CHECK OK IAW CRJ 900 MM 33-51-00-710-802-A27.