What was found
AFTER TAKEOFF ,LANDING GEAR WOULD NOT RETRACK. PERFORMED FIM-4885 - 32-61-00-810-815-A - LG SLOW TO EXTEND OR RETRACT. 32-31-00-720-801-A - EXTENSION AND RETRACTION SYSTEM - FUNCTIONAL CHK, GEAR SWUNG 20 TIMES WITH NO FAULTS, ACCOMPLISHED TASK 29-10-00-860-801-A. NO FAULTS NOTED. GEAR SWUNG AN ADDITIONAL 10 TIMES AFTER BLEED, WITH NO FAULTS. SERVICED NLG IAW AMM 12-14-03. REMOVED INOP SELECTOR VALVE IAW AMM 32-31-04. INSTALLED OVERHAULED SELECTOR VALVE IAW AMM 32-32-04. PERFORMED EXTENSION AND RETRACTION FUNCTIONAL CHK, OPS CHKD GOOD IAW 32-31-00, PERFORMED BLEEDING OF THE MAIN HYD SYS IAW 29-10-00. C.H. 21. OPS CHKD GOOD.