As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 3512 -ATB BACK TO DTW, DUE TO WING ANTI-ICE SYSTEM FAULT. RECYCLED WING ANTI-ICE PUSH BUTTON SEVERAL TIMES WITH NO SUCCESS, LEFT ANTI-ICE ON FOR 10 MINUTES WITH NO IMPROVEMENT. CORRECTIVE ACTION: PERFORMED WIPS ELECTRICAL AND PNEUMATIC TESTS WITH NO FAULTS FOUND. RAN ENGINES AND CYCLED WING ANTI-ICE SYSTEM ON AND OFF SEVERAL TIMES WITH NO FAULTS FOUND. LP 6214584