What was found
AIRCRAFT HAS A MUSTY ODOR WHILE THE VCS OPERATES. ARRIVED TO ACFT AND RAN VCS SYSTEM. MUSTY ODOR COMING OUT OF COCKPIT VENTS. GAINED ACCESS AS NECESSARY TO COCKPIT EVAP AND FOUND EVAP TO BE LEAKING WATER FROM PLASTIC SHROUD DUE TO SEPARATION AND THE FACE OF EVAP TO CAKED IN DUST. FOUND CARPET NEXT TO RETURN VENT TO BE DAMP AND HAVE A MUSTY ODOR. CLEANED EVAP FACE AND RE-SEALED SEPERATION IN PLASTIC SHROUD ON EVAP. NO MUSTY ODOR AT THIS TIME.