What was found
LANDING GEAR BLOWDOWN BOTTLE SERVICE: UPON LANDING, GEAR WOULD NOT EXTEND. YELLOW DN WAS DISPLAYED ON GEAR ICAS ALONG WITH GEAR DISAGREE CAS MESSAGE. RAN QRH, BLEW DOWN HANDLE WAS USED TO LOWER NOSE GEAR. MAIN GEAR UPLOCK HANDLE USE TO LOWER MAIN GEAR. LANDED WITH THREE GREEN DISPLAYED. REMOVED INOP LANDING GEAR HANDLE MODUEL AND INSTALLED OVERHAULED LANDING GEAR HANDLE UNIT IAW 32-30-30. PERFORMED OPS CHECK, OPS CHECK GOOD. SERVICED HYDRAULIC RESERVOR !AW 12-10-30. NO DEFECTS NOTED. ORIG SUBMISSION DATE: 12/30/2022