As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(PIREP) PLACED GEAR HANDLE DOWN, GOT 3 RED INDICATIONS ONLY. GEAR CAME DOWN ON IT'S OWN AFTER GO AROUND WITH CLIMB TO 3000 FT. ALTERNATE GEAR EXTENSION LIGHTS SHOWED 3 DOWN. ANTI-SKID TESTED OK. (MX) REMOVED AND REPLACED LANDING GEAR CONTROL UNIT IAW DHC-8MM 32-30-05 PG 201-203. FUNCTIONAL GEAR RETRACTION CHECK GOOD IAW DHC-8 MM 32-30-00 PG 203-204.