As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ZONE HIGH TEMP, ENGINE AIR 1 FAULT AND VALVE ENGINE AIR 2 FAULT, VALVE AND PACK 1 VALVE ALL ILLUMINATED. RETURNED TO DTW TO AVOID ICING CONDITIONS. MAINTENANCE TIGHTENED PERI SEAL CLAMP IN ZONE 2. GROUND RAN A/C AT 80 PERCENT N2 FOR 15 MINUTES, NO FAULTS FOUND. ALL CHECKS GOOD.