As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE AIR INLET INOP INFLIGHT. RETURNED TO SFO. UPDATE: LEFT ENGINE AIR INLET REPORTED INOP BY CREW ON FLIGHT TO PDX. INSTALLED SERVICEABLE PRESSURE SWITCH ON LEFT ENGINE INLET. OPS CHECK GOOD. REMOVED AND REPLACED LEFT ENGINE EJECTOR VALVE IAW 30-20-04. OPS CHECK GOOD.