As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUNNING UP ENGINES FOR TAKE-OFF, GOT STEADY BANGING. RPM BARELY PAST IDLE. FLIGHT ATTENDANTS GUESS THE NR 2 ENGINE. TAKE-OFF ABORTED. R&R PRBC IAW MM 75-31-11 OPS CHECK OK ON NR 2 ENGINE. BLEED VALVE SCHEDULING COMPLETED PER PWA MM 72-00-00. LUBED 8TH AND 13TH STAGE BLEED VALVES ON NR 1 AND 2 ENGINES PER PWA MM 75-30-00. NO FAULTS NOTED. AIRCRAFT RETURNED TO SERVICE.