What was found
FLT NR 3060 - PHL-DCA - ON TAKEOFF ROLL, THE ENGINE FAILURE WARNING LIGHT ILLUMINATED ON BOTH SIDES OF THE COCKPIT. THE TAKEOFF WAS ABORTED AND THE CREW DETERMINDED THERE HAD BEEN A FAILURE OF THE AUTO FEATHER ENGINE FAILURE WARNING SYSTEM. AFTER RECEIVING AN MEL ASSIGNMENT. THE AIRCRAFT PROCEEDED WITH A NORMAL TAKEOFF. AT RON, THE READ OUT WIRING TO ALL ENGINE PRESSURE SWITCHES WAS GOOD. OPS CHECKED NR 1, 2, 3, AND 4 SWITCHES. FOUND NR 1 BAD. REMOVED AND REPLACED NR 1 OIL PRESSURE SWITCH.