That's strictly an analogue unit so I would only consider repair if you have no intention to ever add any digital sources. As long as one one the transformers has not gone, the power supply should be repairable but what else could be wrong and how much money do you want to put into a 20 year old AVR? Only issue I can foresee is what are you using for source material? Newer AVRs have a limited number of analogue inputs. If you have a lot of analogue sources, you may run out of inputs, so I would research that first.
You also have not mentioned what type of display you are using. If it is an analogue display that could be an issue because modern AVRs all use digital HDMI outputs. Finding an AVR with component out will be a challenge. Sometimes when one piece goes it may involve a complete system upgrade. When I replaced my TV, I also replaced the AVR at the same time since both pieces should support the latest HDMI spec.