I have an FX90 that has been with me for almost 2 decades. Recently the delay signal has been cutting out. I remember FM Christopher had his Buzzbox re-switched, anyone know a tech who can fix this?

I am not sure the issues you are describing cutting in and out would come from the switch. You can replace the switch the momentary switch DOD used it is still available. If you are looking for a try bypass type of thing that is a bit more complicated as you have to rewire the pedal to be always on if you use the traditional stomp switch. This add in circuit says it can do true bypass without any other switch or wiring changes;https://www.ebay.com/i/191359719511?chn=psWhich looks like a nice option if it can do what it says.When the cutting in and out happens do you lose the original signal and have no echo? Because it may be something like a solder joint going bad. Two decades is probably more than DOD thought someone would be using these when they built them. They sell for around $100 so you might be better off buying a used working dollar wise than the cost of repair. But although your description of you issue is not too clear if you can use a soldering iron I would open it up and jiggle the circuit connections with a chop sick or coffee stick and see if there is a bad connection causing the issue check if any of the knobs came loose at some point and twisted putting stress on the wired connections and reflow solder the where necessary.

I should have been more clear, I don't think the footswitch is the issue. However given that other forumites have had their pedals repaired and that my pedal was working a few weeks ago, I thought someone might know of a competent tech who could at least take a look at it for me. Thanks again for your help and suggestions

The footswitch is still working, but as I said the wet delay signal has been cutting out. If I was more comfortable with PCBs I might poke around but I don't want to do any more damage. I was just hoping someone here might know a person who could take a look at it

I have seen at different times a lot of folks who seem to have the switch replaced on pictures on the forum. So the info is out there somewhere.I think you might get the eyes of more people if you changed the title to something like; "Who can put a better switch in my DOD delay?"Just a suggestion as it is more clear as to your goal.