marantz pm7200

Hi everyone, I have B&W 684 floorstanders and a Marantz PM7200 amp, playing a mix of Spotify and FLAC through a Yamaha WXC-50 streamer/DAC. This was my first ever hi-fi setup, assembled second hand for under £1000, and for many years it has served me well, but I'm looking to make the step up...

HI, I have a marantz pm7200. It must be 20 odd years old and was bought second hand. I know that it's supposed to be a good amp but I think it needs a service. A service will cost over £150 though. My question is how much can a service improve the sound of an amp.? Or should I just cut my...