What was found
SHORTLY AFTER SETTING TAKEOFF PWR, NR 3 THRUST REVERSER CAME ON. ABORTED TAKEOFF & RETURNED TO RAMP. REMOVED AND REPLACED #3 ENGINE O/B UPPER FEEDBACK ACTUATOR AIW ATA/WRI 78-30/2865 AND ATA/WRI 78-30/2869. A/C OK FOR SERVICE. REMOVED AND REPLACED #3 ENGINE O/B UPPER FEEDBACK ACTUATOR, IAW AMM 78-32- 01-4-2. PERFORMED OPS TEST OF THRUST REVERSER SYS, OPS & LEAK CHECKED GOOD. PERFORMED ENGINE CHECK NR 10 TEST, IAW FIM N72-00-00-1. ALL NR 3 ENG THRUST REVERSER POS VALUES IN EEC3A/B ARE WITHIN LIMITS. TEST PASSED, OPS CHECKED GOOD. A/C OK FOR SERVICE.