As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 OIL LOW PRESSURE BLINKING EVERY FEW SECONDS. ILLUMINATION OCCURRED JUST AFTER TAKEOFF AND CONTINUED ALL THE WAY TO THE GATE. AIR RETURN TO MSP. MAINTENANCE REPLACED PRESS WARNING PROCESSOR, NO FIX. REINSTALLED ORIG. REPLACED OIL PRESS X-DUCER, OPS CHECK NO GOOD. LEAK GOOD. P/N ON 2-303-869-01. S/N ON 892321, OFF/02153380021. PIGGY BACKED HARNESS P/N 2-303-919-03 ON TO NR 2 ENGINE. OPS CHECK GOOD. INITIATED PLANNING WATCH ITEM TO PERMANENTLY INSTALL HARNESS AT NEXT ENGINE REMOVAL.