What was found
AIR TURNBACK, DURING CLIMB AT APPROX 17,000 FT, RUMBLE HEARD ON NR 2 ENG AFTER ENG ANTI-ICE WAS TURNED OFF, ENG LOST POWER FROM 1.95 TO 1.7 EPR, N1 FROM 95 PERCENT TO 83 PERCENT, FUEL FLOW DROPPED TO 100 LBS. ALL OTHER INDS NORMAL. REMOVED AND REPLACED NR 2 ENG PER MM.