As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO DEN DUE TO NR 3 ENGINE OIL PRESSURE LOW AND LOST OIL QUANTITY. PULLED THROTTLE BACK TO IDLE BUT DID NOT SHUT DOWN ENGINE. *S/D* THE SHOP FOUND NO PROBLEM WITH THE BASIC ENGINE. THE ANTI-ICE TUBE HAD FAILED AND WAS BLOWING HOT AIR ON THE HARNESS RESULTING IN WHAT APPEARED TO BE AN INDICATION PROBLEM. HARNESS CHECKED GOOD. REPLACED THE ANTI-ICE TUBE ASSEMBLY. OTHER UNRELATED WORK WAS PERFORMED WHILE THE ENGINE WAS IN THE SHOP.