As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WOULD NOT EXTEND ON APPROACH (NO GREEN INDICATION. FOLLOWED CHECKLIST. EMERGENCY DECLARED. MANUAL GEAR EXTENSION COMPLIED WITH AND TOWER CONFIRMED. LANDING WAS UNEVENTFUL. MAINTENANCE REPLACED A FAILED GEAR UP PRESSURE SWITCH. GEAR SWINGS PERFORMED WITH NO DEFECTS. AIRCRAFT WAS RETURNED TO SERVICE.