What was found
FLT AZ9162 - MXP-ORD - ON TAKEOFF ROLL AT 20 KNOTS, THE FLT CREW SAW A MOMENTARY RED FLASH ON THE EICAS. BELIEVED TO BE A FIRE WARNING MESSAGE, BUT IT WAS TOO QUICK TO READ. TAKEOFF WAS ABORTED WITHOUT EXCEEDING TAXI SPEED AND A/C RETURNED TO BLOCKS. WHEN A/C ARRIVED AT THE BLOCKS, THERE WAS NOT EICAS MESSAGE. ALSO, THERE WERE NO PRESENT LEG FAULT(PFL) MESSAGES. PERFORMED FIRE WARNING/OVERHEAT TEST AND FOUND TO BE NORMAL. AIRCRAFT VISUALLY CHECKED FOR ABNORMALITIES AND NONE FOUND. NO HISTORY MESSAGES IN THE CMC. UNABLE TO DUPLICATE THE REPORTED DISCREPANCY. (M)