What was found
ONE MINUTE AFTER T/O PER MEL, GEAR LEVER POS UP. LANDING GEAR DID NOT RETRACT. ECAM L/G RET FAULT COMPLIED WITH. L/G ATTEMPT AT 4000' 220 KIAS L/G DID NOT UNLOCK, THREE GREEN, DOORS OPEN. FOUND PDEU FAULTING CODE 03 AND 04. REMOVED AND REPLACED PDPU PER 32-31-71-04. OPS CHECK NORMAL. PERFORMED GEAR EXTENSION AND RETRACTION TEST PER MM 32- 31-00-5. OPS CHECK NORMAL.