As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: COWL VALVE FAILURE ON BOTH ENGINES AT CRUISE WHEN ATTEMPTING TO USE ENG ANTI-ICE; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. ACCOMPLISHED ANTI ICE GROUND TEST FOR BOTH ENGINES PER AMM 30-21-11-400-801, NO FAULTS NOTED, NO HISTORY, GOOD FOR RETURN TO SERVICE.