As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDIS 628 79-32 7899 02JUL19 BOS OPEN U LOGPAGES:2725454 ENG 2 RPM LO, FOLLOWED BY ENG 2 OIL PRESSURE LO, OIL PRESSURE WAS "0". PRECAUTIONARY MANUAL SHUTDOWN. FL310 @0030Z REMOVED NO 2 ENG IAW W/C 71T0002-PW. INSTALLED NO 2 ENGINE REF W/C 71T0902-PW. A/C IS OK FOR SERVICE