As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE RECEIVED A DE-ICE PRESSURE CAUTION LIGHT. RAN THE CHECKLIST AND THE LIGHT WENT OUT. 15 MINUTES LATER IT RETURNED. THE ADVISORY LIGHT FOR THE RT BOOT SEGMENT FLICKERED. DE-ICE PRESSURE WAS OK. MAINTENANCE REPLACED THE NR4 DDV VALVE. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.