As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED LOSING BACKGROUND COLORS (BLUE/BROWN) ON CAPTAIN'S PFD & THEN ON FIRST OFFICER'S PFD. CHECKED LEFT AND RIGHT AIR CONDITIONING PACKS FOR LOOSE DUCTS, NONE NOTED. PRESSURIZED CABIN TO CHECK PACK FLOW, EACH PACK WOULD PRESSURE CABIN ABOVE GPSID SEPARATELY. CLEANED DIVERTED VALVE ASSY. REMOVED, CLEANED AND REINSTALLED COOLING FAN DIVERTER REF MD80 MM 21-50.