As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRFOIL ICE PROTECTION PRESSURE ABNORMAL AND PRESSURE HIGH LIGHTS ILLUMINATED WITH TAIL DEICE SELECTED AFTER TAKEOFF. FLIGHT RETURNED TO DTW AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED TAIL ANTI-ICE VALVE. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.