As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON APPROACH INTO ROC, THE LANDING GEAR WOULD NOT EXTEND NORMALLY. ALTERNATE EXTENSION PERFORMED, LANDED A/C WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT SYSTEM, FOUND THE LANDING GEAR SELECTOR VALVE AT FAULT. REMOVED AND REPLACED IAW DHC MAINTENANCE PROCEDURES. A/C RETURNED TO SERVICE. (M)