As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, LANDING GEAR WOULD NOT RETRACT. ALONG WITH AUTO THROTTLE FAILING TO ENGAGE AND MANUAL SPOILER FAULT. AIR RETURN TO DTW. MAINTENANCE CLEANED SNOW AND ICE FROM MLG SQUAT SWITCHES. PERFORMED SEVERAL NORMAL GEAR SWINGS, ALL CHECKS GOOD OF ALL ASSOCIATED SYSTEMS.