A B757-200 FLT CREW ON TKOF AT DEN EXPERIENCED HIGH ENG EGT ON EICAS; SO THEY ABORTED THE TKOF. THE PROB WAS TRACED TO MALFUNCTIONING EICAS WHICH MAINT WAS APPARENTLY AWARE OF.

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WE TURNED IN TO THIS ACFT IN DENVER ON A QUICK TURN. DURING INITIAL COCKPIT SETUP; FOUND EICAS COMPUTER SWITCH IN THE R POS. LOOKED IN MAINT BOOK; NO DEFERRALS; SO WE POSITIONED THE SWITCH BACK TO 'AUTO.' LOWER EICAS SCREEN WAS ERRATIC; BUT AFTER CYCLING SWITCH BECAME NORMAL. UNEVENTFUL PUSH AND START. DURING TKOF ROLL AS I WAS OBSERVING THE L ENG INDICATIONS; THE EGT POINTER AND SCALE WERE RED; INDICATING A HIGH EGT. I CALLED 'L ENG EGT' AT AROUND 80 KTS. CAPT OBSERVED INDICATION FOR ABOUT 1 SECOND AND INITIATED AN ABORT AT AROUND 100 KTS. REJECTED TKOF ENGAGED AND THE CAPT DISENGAGED IT AFTER ABOUT 1 SECOND. ACFT WAS AT A NORMAL SPD FOR RWY EXIT AND CAPT TAXIED OFF AND CONTINUED MOVING SLOWLY DOWN TXWY. WE ENDED UP IN 'C' DEICE PAD FOR ABOUT 10 MINS TILL RETURN GATE OPENED UP. CAPT AND I DISCUSSED WHAT HAPPENED AND WERE LOOKING AT THE MAX AUTO MAX INDICATION ON THE SCREEN WHICH WAS ELL BELOW MAX FOR TKOF. THIS DID NOT SEEM TO MATCH WITH THE RED INDICATIONS WE HAD ON TKOF. UPON INVESTIGATION BY MAINT; THEY DETERMINED THE L EICAS COMPUTER WAS SOMEHOW STRUCK IN START MODE AND WAS PROVIDING FALSE OVERTEMP INDICATIONS FOR TKOF. I THINK THIS PROB SHOULD HAVE BEEN FIXED BEFORE WE EVEN GOT THE AIRPLANE SINCE IT HAD HISTORY AND HAD BEEN FLYING WITH SPURIOUS EGT INDICATION FOR SEVERAL LEGS BEFORE WE GOT THE ACFT.