Lesson learned, eh? Preflight those hyrdraulic drive belts well.
Higher level lesson: dont fly those helos with belt drive hydraulics. How many people have to die before this gets fixed? Kind of like carb heat on piston acft engines - a better solution (less lethal) has been known for decades. OTOH, I understand that EC if finally offering dual hydraulics on the AS series - two belts to worry about?
Rant over.