What was found
B HYD FLUID LOSS IN FLIGHT AT CRUISE 36,000 FT AMBER CAS HYD VOL LOW B; RAN CHECKLIST. UNLOADED B HYD PUMP WHEN VOLUME WAS DOWN TO 8 PERCENT. AFTER UNLOAD, VOLUME RECOVERED TO 13 PERCENT AND HYD TEMP ROSE TO 74. ON POST FLIGHT INSPECTION FOUND BRAKES SMOKING FROM HYD FLUID ON THEM; ALSO MAIN GEAR WHEEL WELL AND BOTTOM OF ACFT AFT TO TAIL DRIPPING HYD FLUID. ISOLATED LEAK TO PTU CONTROLLER. LEAKING FROM UPPER BOSS. COMPLETED CLEANING REMOVED THE PTU CONTROLLER AND INSTALLED AN O/H PTU CONTROLLER. IAW THE MM 29-20-04. PERFORMED BLEED, OPS, AND LEAK CHECKS ALL NORMAL.