What was found
(CAN) UPON LANDING NR 2 GENERATOR WENT OFF LINE RED ANNUNCIATOR GEN 2 OFF ILLUMINATED. PILOT WAS UNABLE TO RESET GENERATOR. INVESTIGATION OF GENERATOR SYSTEM FOUND NR 2 GENERATOR BRUSHES WERE WORN TO THE EXTENT THE BRUSHES NO LONGER CONTACTED THE SLIP RINGS. A NEW GENERATOR WAS INSTALLED. GROUND RUN CARRIED OUT AND ALL WAS SATISFACTORY. SUBMITTER STATED THERE IS NO CALL OUT IN THE PILATUS MAINTENANCE MANUALS TO INSPECT CONDITION OF NR 2 GENERATOR BRUSHES FOR CONDITION OR LENGTH.