As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NR 2 ENG OIL QTY READ ZERO LO FOR 20 MINUTES. LATER, NR 2 ENG OIL PRESS BEGAN FLUCTUATING INTO YELLOW RANGE. AN EMER WAS DECLARED. THE FLIGHT LANDED WITHOUT INCIDENT. RT ENG OIL PRESS WAS 22 PSI. THE ACFT WAS REMOVED FROM SERVICE. REPLACED RT ENG FUEL & OIL HEAT EXCHANGER.