As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSP - FLT 3272 - UPON CLIMBOUT, THE LT ENGINE RPM DROPPED TO 45 PERCENT, THE ENGINE STARTED TO NTS AND THE OIL PRESSURE DROPPED TO ZERO. THE ENGINE WAS SHUTDOWN THROUGH STOP AND FEATHER. THE AC RETURNED TO MSP AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE OIL PUMP. ENGINE OPERATED SATISFACTORILY. (W)