As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJC - AIR TURNBACK - 3/26/01 - THE AIRCRAFT EXPERIENCED A VIBRATION FROM THE LEFT SIDE OF THE FUSELAGE AND RETURNED TO SJC. TECHNICIANS WERE SENT FROM PHX WHO PERFORMED A VISUAL INSPECTION OF THE AIRCRAFT - FOUND NO DISCREPANCIES. REMOVED AND REPLACED THE FWD OUTFLOW VALVE AS THE MOST LIKELY CAUSE; ALSO REPLACED THE EQUIPMENT COOLING VALVE AS A PRECAUTION; NO FURTHER VIBRATIONS NOTED. PART: VALVE, EQUIP. COOLING EXHAUST - MFG: ABLE CORP. - P/N: 31040 - S/N: 1149 - LOC: FWD E/E COMP - COND: PRECAUTION - T.T.: 2576 - T.C.: 1680