What was found
FERRY FLIGHT ABORTED TAKEOFF APPROX 40 KNOTS DUE TO MASTER CAUTION, DOORS RT AFT OVER WING LIGHT ILLUMINATED. MX ACCOMPLISHED PSEU BITE TEST AND RESET LATCHES IAW FIM 52-20 TASK 801. OPERATED DOOR SEVERAL TIMES, OPS CHECK NORMAL. NO FAULTS AT THIS TIME. ACFT ARRIVED WITH NO ANOMALIES. ABORTED TAKE OFF APPROX 30 KNOTS DUE TO MASTER CAUTION, DOORS RT AFT OVER WING LIGHT ILLUMINATED. ACCOMPLISHED PSEU BITE TEST AND RESET LATCHES IAW FIM 52-20 TASK 801. OPERATED DOOR SEVERAL TIMES OPS CHECK GOOD. FLIGHT ABORTED TAKE OFF A SECOND TIME FOR THE SAME ANOMALY. MX GROUNDED ACFT UNTIL THE ANOMALY IS CORRECTED. MX FOUND OVER WING DOOR SWITCHES WHERE COATED WITH CORROSION PREVENTATIVE CAUSING THE SWITCHES TO STICK RESULTING IN FALSE WARNINGS. SWITCHES WERE CLEANED AND OPS CHECKED AND RETURNED TO SERVICE. NO OTHER FAILURES HAVE BEEN NOTED.