As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO FIELD FOR R ENG OIL PRESSURE MASTER WARNING. RETURNED TO MSP. FLT # 4178 CLOSEDCONFIRMED RT EDP DRAIN TO BE LEAKING OIL ABOVE LIMITS. REPLACED RT ENGINE EDP GEARBOX CARBON SEAL. VERIFIED NO LEAKS AT BAGGED DRAIN FOR EDP CARBON SEAL DRAIN. OK FOR CONTINUED SERVICE.