What was found
DURING TAKEOFF ROLL, NR 2 ENGINE OVERTEMPED TO INDICATED TEMP OF 999+ DEGREES C FOR 2 MINUTES, UNTIL POWER REDUCTION. ACFT GROUNDED. PERFORMED BOROSCOPE INSPECTION IAW MM 71-00-00-800-804-F00, STEP 4.F.17, C, 1 & 2. NO DEFECTS NOTED. MAINTENANCE MESSAGE 77-10852 &77-20862 LOGGED, BOTTOM RT EGT SIGNAL T49552, READS 207 DEGREES & BOTTOM LT EGT SIGNAL T49553 READS 785 DEGREES - REF FIM 77-21, TASK 802 & 803. R & R NR 2 EEC IAW AMM 73-21-60-000-801-F00. FAILED EEC TEST IAW 73-21-00-700-804-F00. ALL OTHER EEC POST INSTALL TESTS ACCOMP SATISFACTORILY. REMOVED NR 2 ENGINE BOTTOM LT EGT PROBE BUT 2 CASE STUDS BROKE OFF AT LOWER PROBE HOLE, IAW AMM 77-21-01-000-801-F00, EVEN THOUGH STUDS & NUTS WERE SOAKED REMOVAL FLUID TWO HRS PRIOR. R & R NR 2 ENGINE RT EGT PROBE IAW AMM 77-21-01. ALSO DISCOVERED LPT BORESCOPE PLUG S20 BOSS HAS LOOSE NUT & TACK WELD IS BROKEN. REMOVED NR 2 ENGINE IAW T/C 78471000 INSTALLED NR 2 ENGINE IAW T/C 78471001.