As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG ANTI-ICE #2 COWL VALVE OPEN LIGHT (BLUE) STAYS ON WITH SWITCH OFF, WITH CORRESPONDING AMBER TAI ON THE ENGINE DISPLAY. GROUNDED - YES. OPERATED #2 ENG COWL ANTI-ICE VALVE MANUALLY & PERFORMED OPERATIONAL TEST IAW B737-900 AMM 30-21-00-710-801. OPS CHECK GOOD.