As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT WING ANTI-ICE VALVE DID NOT OPEN W/ WING ANTI-ICE SWITCH ON. GROUNDED - YES. PERFORMED WING ANTI-ICE VALVE HEALTH CHECK ON RH WING TAI REF ASA T/C MAX-30EA-24968. OPS CHECK NORMAL AND NO DEFECTS NOTED. A/C OK FOR CONTINUED SERVICE.