What was found
(CAN) DURING RETURN TO FIELD PILOT NOTED SINGLE PACK LH WOULD NOT PRESSURIZE AC PROPERLY AND RECIEVED COMPLAINTS OF WOOZINESS FROM PAX AND TINGLING SENSATION IN THE TOES OF THE FO. CORRECTIVE ACTION: REMOVED AND REPLACED L/H AND R/H PRESSURE REGULATING SHUTOFF VALVES (PRSOV) WITH SERVICEABLE UNITS IN REFERENCE TO CRJAMM 21-51-43. PERFORMED OPS CHECK OF PRESSURIZATION CONTROL SYSTEM IN REFERENCE TO AMM 21-31-00. (TC# 20191021033)