What was found
FAT - AFTER T/O, WHILE CLIMBING THROUGH 2000 FT, CABIN PRESS REPORTED TO FLUCTUATE PLUS/MINUS FT/MIN IN AUTO MODE. A/C RETURNED TO STATION WITHOUT INCIDENT. MX FOUND WATER CONTAM IN PRESS CONTROL SWITCH. REMOVED MOISTURE FROM SWITCH. PRESSURE SYSTEM OPERATIONAL CHECK NORMAL IN MANUAL AND AUTO MODE. A/C RETURNED TO SERV. INTERMITTENT PRESS CONTROL PROBLEM REOCCURED ON SUBSEQUENT FLIGHTS. REPLACED THE PRESS ELECTRICAL CONTROLLER. (M)