What was found
AT TAKEOFF, THRUST WITH ENGINE ANTI-ICE ON NR 3 EPR AT 2.18, NR 3 N1 INDICATED 80 PERCENT WITH TARGET N1 96 PERCENT. AIRCRAFT WEIGHT 151.5, IAS AT RTO - 85KTS, OAT - -1C, PRESSURE ALTITUDE 680 FT, BAROMETER 29.61, AND BRAKE ENERGY ZONE - NORMAL. INSPECTED ENGINE NR 3 C-1, C-2, INLET, EXH, LPT, SADDLE DUCTING, PT7, PT2, AND TIT PROBE. RUN ENGINES NR 1 AND NR 3 TO EPR 2.20, N1, N2, EGT, AND FUEL FLOW PARAMETERS NORMAL. SUBJECTED ENGINES TO VARIOUS BLEED LOADS (ANTI-ICE, PACKS) ALL OPS NORMAL IAW JRH 7.0. REMOVED AND REPLACED N1 TACH GENERATOR IAW BMM 77-21-1. COMPLIED WITH RTO SPCC CHECKS IAW BMM 05-51-121, ALL OPS NORMAL.