As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCI INFLIGHT T358/27JUN PHX TO ORD. CREW REPORTED LOSS OF OIL AND PRESSURE ON NR ONE ENGINE. CREW SHUT DOWN ENGINE. LANDED MCI WITHOUT INCIDENT. SINGLE ENGINE TIME APPROXIMATELY 20 MINUTES. FOUND CRACK IN OIL LOW PRESSURE SWITCH TUBE. REPLACED TUBE FOR OIL PRESSURE SWITCH ON NR ONE ENGINE. SYSTEM GROUND CHECKED NORMAL OPERATION. (A)