What was found
AIRCRAFT WAS GROUNDED. ENG #1 N1 VIBRATION 9.9 IN LEVEL FLIGHT AT 9000 FT 210 KTS, MILD VIBRATION FELT IN FLIGHT DECK. ACCOMPLISHED 1 SHOT TRIM BALANCE OF #1 ENGINE PER AIRBUS AMM 77-32-34-750-001A. ACCOMPLISHED TSM 77-00-00-810-864. GROUND RAN AIRCRAFT PER 71-00-00-710-009B AND 77-32-34-860-043. ALL VIBRATION PARAMETERS WITHIN LIMITS, NO FURTHER DISCREPANCIES NOTED AT THIS TIME. SUPPLEMENT TO BE FILED UPON FINAL CORRECTIVE ACTION. (OPEN).