What was found
CREW RECEIVED AN A-I WING 2 LEAK MSG DURING DESCENT INTO DTW, CREW FOLLOWED QRH AND DE-SELECTED ICE PROTECTION WING AND LOOKED TO EXIT ICING CONDITIONS. CREW WAS DENIED CLEARANCE FOR LOWER BY ATC, THEN DECLARED EMERGENCY TO GET OUT OF ICING CONDITIONS, NO FURTHER PROBLEMS OCCURRED WHILE IN FLIGHT. MAINTENANCE TROUBLESHOT IAW FIM 30-11-00-810-819-A, MSG CLEARED AND NO FAULTS NOTED.