As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE TO HLN CLIMBING THROUGH 28,000 FT, RECEIVED AN APU LOW OIL PRESSURE LIGHT ON EICAS ONE. RETURNED TO SLC. SERVICED APU OIL TO CORRECT LEVEL. INSPECTED APU AND OBSERVED NO LEAKS OR OTHER ABNORMALITIES. OPS CHECKS GOOD AT THIS TIME.