What was found
WHILE LEVEL AT FL330 CABIN RATE INDICATOR CONTINUOUSLY FLUCTUATES BETWEEN +-200KPM. LH DUCT PRESSURE HOLD STEADY AT 40PSI. RH DUCT PRESSURE CONTINUOUSLY FLUCTUATES BETWEEN 42-46 PSI IN CONJUCTION WITH CABIN RATE INDICATOR. ALL OTHER PRESSURIZATION INDICATIONS STEADY AND INDICATING PROPERLY AND NORMAL. CABIN RATE FLUCTUATIONS GREATER WHEN CHANGING CABIN TEMPS. GROUNDED - YES. RAN B737-900 FIM 21-33 TASK 802, GVI OF RH PACK, NO LEAKS NOTED. RAN FIM 21-62 TASK 801 RH PFTC SHOWS EXISTING UNLATCHED FAULT 21-51253 FOR RH FCSOV, RAN FIM 21-62 TASK 857 RESET AND TEST OF RH PFTC, PASS TEST. OK FOR SERVICE.