What was found
FLT#954, SJU-MCO. (AIRCRAFT PERFORMED AN AIR TURN BACK) 'VENT SKIN FAULT AVIONICS SYSTEM FAULT. AIR RETURN; REMOVED AND REPLACED SKIN AIR OUTLET VALVE (22HQ) AS PER AMM 21-26-53. ALL OPS / IND CHECK IS GOOD, NO DEFECTS NOTED AT THIS TIME. MEL CLEARED. PLACARD REMOVED. MX-4 LIST UPDATED. MCC NOTIFIED.'