What was found
INSPECTION TYPE: NA ATB, NO EMERGENCY DECLARED, NO EQUIPMENT USED. A/C TAKEN OUT OF SERVICE. LANDING GEAR FAILED TO RETRACT ON TAKEOFF COMPLIED WITH AOM PROCEDURE & RETURNED FOR AN UNEVENTFUL LANDING. ECAM DISPLAYED L/G RETR FAULT FAULT, REMAINED FOR BOTH LAND GEAR POSITION DETRACTION SYSTEM. PLACED ON MEL 32-30-01, DMP ACCOMPLISHED. R & R PROXIMITY DETECTOR PROCESSING UNIT, PER AMM 32-31-71. OPERATIONS CHECKS GOOD. PERFORMED GEAR SWING, PER AMM 07-11-00 & 32-31-00 STEP 5. GEAR SWING HAD NO ISSUES. OPERATIONS CHECK GOOD. M727932 CLOSED.