What was found
GEAR WOULD NOT RETRACT ON T/O. SWITCHED TO SYS 1, NO JOY. COMPLIED WITH QRH. RETURNED FIELD. ALSO PITCH TRIM NR 2, ATS, NR 1 PRESSURE REGULATOR FAULTED AT SAME TIME. PILOT ATTEMPTED TO THROW THE HANDLE, WOULD NOT GO PAST HALFWAY. THEN GOT ECAM INDICATION, ALONG WITH PITCH TRIM, ATS, AND PRESS REG DROPPING OFF, THEN TRIED SYS 1. CREW STATED ACFT ACTED AS IF IT WAS STILL IN ' GROUND' MODE. ON WALKAROUND, NO OBVIOUS DEFECTS NOTED. CREW ALSO STATED ACFT WAS NOT PRESSURIZING. R & R PRESSURE INDICATOR REF MM 32-11-15-04-0 OPS CHECK NORMAL. CHECKED PROX BOX SHOWED NO FAULTS. PERFORMED GEAR SWING REF 32-31-00. AS PRECAUTIONARY R & R PROX DECTECTOR UNIT REF: MM 32-31-71-04. R & R LANDING GEAR HANDLE REF: 32-31-11-04. PERFORMED GEAR SWING ON BOTH SYS 1 AND 2. GEAR SWING NORMAL.