What was found
APU PNEUMATICS INOP(<P>TRANSFERRED TO MDDR 149618 IAW MEL 49-11-01-01, CAT C.</P> / <P>LP 1361901 - ON A/C ARRIVAL WE ACTIVATED PNEUMATICS ON APU, WE HAD 30 PSI OF DUCT PRESSURE WITH PACKS OFF, WITH BOTH PACKS RUNNING WE HAVE 20-25 PSI OF DUCT PRESSURE, RAN APU PNEUMATICS WITH HIGH DEMAND FOR APPROX 4HRS AND NEVER LOST PNEUMATICS. WE COULD NOT DUPLICATE FAULT ON GROUND, SUSPECT FAULT ONLY OCCURS AT LANDING WHEN MOISTURE IS PRESENT ON APU LINES AND VLV. DMI REMAINS OPEN FOR CONTINUED T/S.</P> / <P>LP 1363575 - REMOVED AND REPLACED APU BLEED SHUTOFF VLV IAW 36-11-00. OPS CKS NORMAL AT THIS TIME. THIS CLEARS MDDR 149618.</P>)