As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN LANDING GEAR DID NOT EXTEND NORMALLY. USED MANUAL BLOW DOWN PER CHECKLIST TO EXTEND LT MAIN. FOUND LT MLG GEAR DOWN LOCK SWITCH HAD ERRONEOUS RESISTANCE VALVE WHEN SWITCH IS FROZEN, 0.0 TO 5.8 OHM. REMOVED LT MLG GEAR DOWN LOCK SWITCH, AND INSTALLED A NEW SWITCH OF SAME P/N. PERFORMED LANDING GEAR FUNCTIONAL TEST. OPS TEST CHECKS GOOD. ALL WORK ACCOMPLISHED IAW CE-750 MM CHAPTER 32-00-01.