What was found
ON TAKEOFF ROLL AT 75 KTS GEN 1 & GEN 3 FLASHED OFF. REJECTED TAKEOFF. GENS BOTH RESET AUTOMATICALLY. TRIED SECOND T/O. AT 52 KTS GEN 1,2,3 ALL OFF. REJECTED TAKEOFF. ALL 3 GENS CAME BACK ONLINE THEIR OWN. WX 040/4 KTS,15 DEG C. LIGHT RAIN. ACFT WAS LOADED IN RAIN. INTERROGATED EPCU FOR FAULT REVIEW, FOUND ON LEG 2 MAIN EXT PWR/INTFC PHASE C SENSE/EXT PWR WAS LOGGED. CHECKED ALL IDG FLUID LEVEL, FOUND SATISFACTORY ON ALL IDG. ALSO VISUALLY CHECKED WIRING CONDITION AT BACK SIDE OF EPCU RACK, NO DEFECT FOUND. R & R EPCU IAW AMM24-08-01-4, R-T-S TEST WAS SATISFACTORY. ACFT OK FOR SERVICE. PREMATURE REMOVAL/INSTALLATION.