What was found
AFTER TAKEOFF YYC, ATTEMPTED TO RAISE GEAR, ABLE, TO THE INTERLOCK POSITION, INDICATED GEAR DOWN, UNLOCKED TRIED CYCLING GEAR AND CIRCUIT BREAKERS. NO LT GEAR PITCH DAMPENER POPPET EXTENDED. LT GEAR PITCH DAMPER REPLACED IAW AMM 32-11-15-4. NR 2 MAIN WHEEL REMOVED AND RE-INSTALLED IAW AMM12-37-32-0-01. NR 2 BRAKE REMOVED AND RE-INSTALLED IAW AMM 32-42-27-4-1. AXEL JACKED IAW AMM 07-12-00 SYSTEM TEST SERVICEABLE ON PROXIMITY SYS ELECTRONIC UNIT IAW AMM 32-00-00-5 RII:501311 PREMATURE REMOVAL/INSTALLATION OFF MFG D22127000-5 POS L SRL DRG45 TAG 651157.