What was found
MASTER CAUTION AND FUEL FLTR BYPASS R ILLUMINATED, CREW FOLLOWED THE EMERGENCY CHECKLIST AND DIVERTED TO KCOS. WEST STAR AVIATION( CRS# PAZR068H) PERFORMED TROUBLESHOOTING BUT COULD NOT DUPLICATE THE ISSUE. FUEL TAKES WERE DUMPED TO INSPECT FOR WATER WITH NO WATER OR OTHER CONTAMINATES FOUND. THE FUEL FILTER ( PN: 120901) WAS REMOVED AND INSPECTED WITH NO DEFECTS FOUND. A NEW FUEL FILTER WAS INSTALLED AND MULTIPLE ENGINE RUNS WERE PERFORMED WITH NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.