As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THRUST SET FOR TAKEOFF, LT AND RT ENGINE EPR 2.08 LT ENG N1 98 PERCENT RT ENG N1 98.7 PERCENT, LT AND RT ENGINE EGT WITHIN LIMITS. ABOUT 100 KTS A STRONG DECELERATION WAS FELT, RT ENGINE EPR DROPPED TO 1.78, AFT CREW REPORTED A LOUD BANG FROM RT ENGINE. AMM 72-00-04 PAGE 112 ACCOMPLISHED. BLEED VALVE LUBRICATED. IAW AMM 75-31-01 PAGE 203 THE FWD PRESSURE RATIO BLEED CONTROL WAS REPLACED. RT ENGINE BOROSCOPE INSP WAS PERFORMED. IAW AMM 72-00-00 PAGE 542. TEST WAS OK.