As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R COWL ANTI ICE VALVE STUCK IN TRANSIT. AMBER TAI LIGHT. GROUNDED - YES. ACCOMPLISHED A #2 ENGINE COWL TAI VALVE OP-CHECK PER B737-800 AMM 30-21-11. ALL TESTS NORMAL. ALSO VERIFIED NO LEAKS AT VALVE. ALL INDICATIONS NORMAL DURING TEST. AC HAS NO SIMILAR HAS NO SIMILAR HISTORY WITHIN THE LAST 180 DAYS. OK FOR SERVICE.