As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING TC 730000-L1-1-VAM, FOUND SMR FAULT FOR THE NR 1 ENGINE CHANNEL A 0391 VIBRATION SYS. PERFORM TSM 77-11-00-810-852-A PARA 4.C. SUBTASK 77-11-00-810-166-A. ACFT GROUNDED. TROUBLESHOT IAW TSM 77-11-00-810-843-A. PERFORMED AN OPS ENGINE IDLE TEST FOR THE NR 1 ENGINE CHANNEL A, IAW AMM 73-29-00-740-803. NO CONFIRMATION OF THE FAULT. NO MAINTENANCE ACTION REQUIRED. OK FOR SERVICE.