As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CREW ABORTED TAKEOFF AT 20KTS DUE TO A RT OVERWING EXIT DOOR WARNING LIGHT ILLUMINATED. INVESTIGATION FOUND THE OVERWING EXIT AFT SWITCH ICED UP THEREFORE WAS NOT WORKING CORRECTLY. SWITCH WAS FREED UP WITH ALCOHOL AND FIM 52-20 WAS CARRIED OUT WITH NO FURTHER FAULTS FOUND.