As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- ON FLIGHT 2438, AT 39,000 FT, SAT -65 DEGREES CELCIUS, LEFT AUTO CROSSFLOW ON FUEL PUMPS STARTED CYCLING EVERY FEW SECONDS AND FUEL WAS NOT TRANSFERING FROM RIGHT TO LEFT TANK UNTIL DESCENDED TO LOWER AND WARMER ALTITUDE. TESTED FUEL TRANSFER SYSTEM WITH NO DEFECTS NOTED. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.