As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- DURING CLIMB, MASTER CAUTION MESSAGE, LEFT TRANSFER SHUTOFF VALVE APPEARED. COMPLIED WITH EMERGENCY CHECK LIST. INTERROGATED MDC. FOUND LEFT TRANSFER VALVE FAULT, CMP/POS DISAGREE, INTERMITTENT H POSITION. PERFORMED FAULT ISOLATION. FAULT DID NOT REOCCUR. NO PARTS REPLACED. GROUND RAN ENGINES. OPERATIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.