In looking at the insides of your amp, the connections to the power on/off/standby switch looks to be press fittings. Can you confirm if they are pressed or soldered. I just sold an SLP 98 to someone and when it arrived the switch was faulty and we're trying to determine the best was to sort it out. If the connections are pressed, it makes it super easy. Otherwise I'll need to walk him through soldering it.
Thanks