As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT CSD OIL PRESSURE LOW MESSAGE ILLUMINATED DURING FLIGHT & APU WOULD NOT START. DIVERTED. MAINTENANCE FOUND NO OIL IN RIGHT CSD WITH FLUID AROUND FILTER AND SERVICE PORT. REPLACED THE CSD, GENERATOR, AND COOLER IAW AMM. BLED FUEL LINE TO APU AND STARTED APU SEVERAL TIME WITH NO ISSUES.