What was found
ON TAKEOFFROLL AFTER HITTING TOGA BUT BEFORE ENGINES WERE STABILIZED AT 2TK BUMP POWER, THE MASTER CAUTION LIGHT ILLUMINATED. AFTER A VERY QUICK SCAN OF THE OVERHEAD PANEL, CAPT ABORTED TAKEOFF. NO ASSOCIATED LIGHTS ON THE SIX-PACK AND NO LIGHTS ON OVERHEAD PANEL WERE OBSERVED. AFTER ABORTING T/O THE MASTER CAUTION LIGHTS EXTINGUISHED. GROUNDED - YES. FMC FFR LOGGED MULTIPLE RIGHT SIDE FAULTS ON LAST 3 LEGS. ACCOMPLISHED FMC BITE REF B737-800 AMM 34-61 TASK 801 WITH NO FAULTS FOUND. ACCOMPLISHED LAND VERIFY TEST REF AMM 22-11-00-700-801 WITH NO FAULTS FOUND. ALL TEST PASS. GROUND VERIFICATION SUCCESSFUL.