My HH ic 100s combo developed a loss of volume and was hissing. Having taken it out of the cab I saw that one of the large filtering caps had popped and was leaking some nice gooo. It doesn't appear to be a simple exchange as its encased in a metal strap and riveted to the chassis! Has anyone changed these? Is it better to change them as a pair? I suspect this is causing the hissing....but a lack of volume?

Thanks guys