This is a question for the DIY audio forum, or similar.
But, the carvers can have problems with their dual rail thing going on, ie higher voltage rail capacitors needing to be replaced.
Pretty good odds it needs a recap if it has never been touched and the recommendation is that you might want to look into the service issues you are facing as soon as possible. That you have been given a kindly bit of notice, via the popping... that the amplifier is on it's way out and that it could cascade to being catastrophic instead of a simple recapping.
But, the carvers can have problems with their dual rail thing going on, ie higher voltage rail capacitors needing to be replaced.
Pretty good odds it needs a recap if it has never been touched and the recommendation is that you might want to look into the service issues you are facing as soon as possible. That you have been given a kindly bit of notice, via the popping... that the amplifier is on it's way out and that it could cascade to being catastrophic instead of a simple recapping.