What was found
RTO: DURING T/O ROLL, FIRE DET LIGHT CAME ON WITH HIGH NR 4 EGT AND BOTH NR 4 ENGINE NACELLE TEMPS WERE APPROX 7.0 T/O ABORTED AT 80KTS. BRAKE O/H LIGHT CAME ON LW/RF. REMOVED AND REPLACED DAMAGE 14TH STAGE DUCT LT SIDE, LEAK CK OK REF MM 75-25-00. ACCOMPLISHED HIGH ENERGY STOP INSPECTION AS PER MM 05-51-10. NO DEFECTS NOTED. BRAKES OK FOR SVC. ACCOMPLISHED HIGH ENERGY STOP INSPECTION PER PER MM 5-51-10 PG 202 SECTION C. NO DEFECTS NOTED. REMOVED AND REPLACED NR 4 ENGINE HIGH STAGE VALVE AS PER MM 36-11-05. OPS CHECKED OK.