As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE CREW NOTICED THAT DEICE BOOT SYSTEM STOPPED WORKING. AS FLIGHT WAS ENTERING INTO ICING CONDITION, CREW CONTACTED DISPATCH AND IT WAS AGREED TO DIVERT BACK TO IAD. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. DRAINED WATER TRAPS & LT MID WING APPLIED 3 PATCHES.