What was found
REJECTED TAKEOFF. SIMULTANEOUS L & C IRS FAULT EICAS AND ASSOCIATED ATT & HDG FAILURES. REFERENCE WRI 05-50-0566: ACCOMPLISHED WATER ACCUMULATION INSPECTION AND REMOVAL REF B757 MM 05-51-99-6. GVI FOUND NO WATER EVIDENCE ON ANY AVIONICS RACK DRIP PANS OR BLACK BOXES. REMOVED WATER THAT HAD COLLECTED FROM BILGE AREAS IN MAIN AVIONICS BAY. OK FOR SERVICE. REPLACED LH IRU PER AMM 34-21-01-4. NEEDS OPS CHECK AFTER CENTER IRU IS R & R ALSO, R & R CENTER IRU PER AMM 34-21-01-4. BOTH CENTER AND LT OPS CHECKS GOOD IAW AMM 34-21-01-4.