TKOF ABORT DUE TO THRUST REVERSE UNLOCKED INDICATION. RE- DISPATCHED ANTISKID LIGHT ACTIVATES.

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FIRST INCIDENT ON INITIAL TKOF ROLL; HIGHSPD ABORT (125 KIAS) DUE TO INDICATION OF R ENG THRUST REVERSE UNLOCKED. RETURNED TO GATE; CALLED FOR FIRE DEPT DUE TO POSSIBLE HOT BRAKES. OBSERVED LIMITS IN BRAKE COOLING CHARTS OF 85 MINS COOLING. MAINT ACTION WAS TO LOCK OUT R REVERSE. ALSO HAD INTERMITTENT ANTISKID LIGHT (POSSIBLE HEATING OF PROBES) CLRED BY MAINT. RE-DISPATCHED TO PBI. UPON SECOND TKOF ATTEMPT TAKING RWY 4R GOT ANOTHER ANTISKID LIGHT. I SELECTED FULL TKOF PWR; ANTISKID LIGHT OUT PRIOR TO TKOF ALL APPEARS NORMAL. TKOF UNEVENTFUL UNTIL ABOUT 400 FT AGL. WHEN R ENG INDICATION OF REVERSE UNLOCKED FOLLOWED BY SEVERAL CAUTION INDICATIONS ON EICAS AND GEAR DOWN INDICATIONS FOR JUST SECONDS. GEAR WAS UP AND LOCKED; REVERSE WAS LOCKED OUT; SO APPEARS TO BE A QUIRK IN WARNING SYS. BY 1000 FT AGL; ALL APPEARS BACK TO NORMAL. WE CALLED COMPANY MAINT AND CONFIRMED STATUS OF ACFT. IT WAS CONSIDERED TO BE A FAULT IN GPWS COMPUTER PART ON ACFT; BUT BACK TO NORMAL. WE CONTINUED TO PBI WITH NO FURTHER PROBS. MAINT MET ACFT WITH FIX IN HAND. THROUGHOUT THESE INCIDENTS; THERE WAS NEVER ANY ACFT HANDLING PROBS (NO YAWS; OR AIRFLOW DISTURBANCE). CTL OF ACFT WAS NORMAL AND NORMAL CAUTIONS AND ADVISORIES BY EICAS CONTINUED TO BE SATISFACTORY. CREWS JUDGEMENT WAS FLT TO PBI WAS SAFE!