As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WING ANTI-ICE CAUTION SYSTEM CANNOT PROVIDE ICE PROTECTION TO 2 OR MORE ZONE PAIRS ON WING OR LOSS OF COMMUNICATION FROM THE WIPCU TO DCA. DB WIPCU SEQUENCE CONTROLLER CARD CHANNEL 3 DB WIPCU SEQUENCE CONTROLLER CARD CHANNEL 2 DB WIPCU SEQUENCE CONTROLLER CARD CHANNEL 1. R & R BOARD CIRCUIT SEQUENCE WIPS IAW AMM DMC-B787-A-30-11-03-00A-720A-A. ALL OPS CHKD GOOD & SOFTWARE LOAD CHKD GOOD.