What was found
LANDING GEAR WOULD NOT RETRACT ON DEPARTURE, RETURNED TO RPVM, HAD LANDING GEAR RETRACTION FAULT PROX. DETECTION BOX FAULTED TO "BR" - BOGIE RIGHT FAIL. ON INSPECTION RT MAIN GEAR, FOUND PITCH DAMPER BUTTON POPPED OUT. FAILED RETRACTION ON BOTH SYSTEMS. COMPLETED RH MAIN GEAR PITCH DAMPER REPLACEMENT IAW AMM 32-11-15-04. CHARGE PITCH DAMPER NITROGEN CHAMBER PER AMM 12-12-32 P. BLK 501. PROX BOX RESETTED, AND AIRCRAFT OK FOR SERVICE.