As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR UNSAFE INDICATION FOR LEFT MAIN WHEEL, LIGHT FLICKERING AND UNLOCK LIGHT ON FLICKERING. RAN 'LANDING GEAR WILL NOT EXTEND' CHECKLIST WITH GEAR MANUAL BLOW DOWN, NO CHANGE IN INDICATION. REMOVED AND REPLACED INOP DIODE WITH A NEW DIODE AS REQUIRED OPS CHECK GOOD. ALL WORK PERFORMED IAW CE-560XL MM CHAPTER 32-30-00 AND 32-01-00.