As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: #2 ENGINE COWL VALVE ANTI ICE CAUTION LIGHT ILLUMINATES. AIRCRAFT DIVERTED AND LANDED SAFELY AT LGA WITHOUT FURTHER INCIDENT. REMOVED AND REPLACED RIGHT HAND ENGINE COWL (TAI) THERMAL ANTI-ICING VALVE. PER AMM 30-21-11. INSTALLATION TEST GOOD. LIGHT SWITCH CHECK GOOD. LEAK CHECK GOOD.