As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT MAIN MOUNT DID NOT LOCK DOWN WITH OTHER GEAR. GREEN LIGHT STAYED OFF ADN RED UNSAFE INDICATOR LIGHT ILLUMINATED FOR 15+ SECONDS. JACKED A/C PERFORMED GEAR SWING I/A/W CE560E M/M 32-01-00. LANDING GEAR HYD SYSTEM ADJ/TEST. GEAR SWING OPS CHECKED GOOD. SUSPECTED MOISTURE IN GEAR DOWN LOCK SWITCH. CLEANED DOWNLOCK SWITCH CONNECTOR. GEAR TRAVEL TIMES WITHIN LIMITS. 5 SECONDS AND 4 SECONDS EXTEND. OPS CHECKED GOOD.