As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOI - GEAR DID NOT RETRACT DURING MISSED APPROACH. WHEN GEAR SELECTED UP THERE WAS AN IMMEDIATE GEAR DISAGREE WARNING MESSAGE. THE GEAR INDICATORS SHOWED THREE GREEN AT ALL TIMES. COMPLIED WITH THE EMERGENCY CHECK LIST AND LANDED WITHOUT INCIDENT. REPLACED PSEU. PERFORMED OPERATIONAL TEST OF LANDING GEAR EXTENSION/RETRACTION. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.