What was found
THE AIRCRAFT WAS GROUNDED. LEFT ENGINE SLOW TO ACCELERATE ON TAKE OFF. THE N1 EVENTUALLY ACHIEVED 90%, BUT EPR REMAINED AT 1.20% AND NEVER REACHED 1.92% TAKE OFF POWER. TAKE OFF ABORTED BELOW 80 KNOTS, BRAKE TEMP NORMAL. EXAMINED LEFT ENGINE EPR SYSTEM IAW AMM 77-11-01. DISCOVERED LOSE CONNECTION ON PT7 MANIFOLD AT 9 O’CLOCK. SECURED B NUT. NO LEAKS NOTED. ACCOMPLISHED TAKEOFF POWER ASSURANCE CHECK IAW AMM 71-00-00. CHECKS GOOD. OK FOR SVC.