As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FREE TURBINE ASSY WAS AT REPAIR STATION FOR A LEAK REPAIR. DURING DISASSEMBLY THE NUT THAT HOLDS THE 6435-20072-101 DRIVE FLANGE WAS FOUND TO BE LOOSE. FURTHER INVESTIGATION SHOWED THAT THE FLANGE HAD PAINT ON THE MATING SURFACES. TORQUEING THE NUT AGAINST PAINT CAUSED THE NUT TO BECOME LOOSE AFTER TIME. THE MFG HAS BEEN NOTIFIED AND IS ISSUING A SB.