So many companies gear require overhauls after 20 years of us
I really don’t think this is fair. Electrolytic caps age. Caps made in the 1980’s were not nearly as good as they are now. Higher temp caps are cheaper and better, with lower inductance.
So please be sure you are comparing accordingly.
Not saying Bryston is not a quality product.
Also, if you replace them with modern caps, I think you will find they will last a lot longer than the originals.