As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENGINE ANTI-ICE COWL VALVE LIGHT ILLUMINATED WITH ANTI-ICE SWITCH ON. GROUNDED - YES. PERFORMED ENGINE ANTI-ICE SYSTEM OPERATIONAL TEST WITH ENGINE IDLE RUN. SYSTEM OPERATED CORRECTLY WITH NO DEFECTS NOTED. COWL VALVE LIGHT DID NOT ILLUMINATE DURING IDLE RUN WITH ANTI-ICE SWITCH ON. REF B737-9 AMM 30-21-00-710-801. GROUND VERIFICATION SUCCESSFUL.