Welcome to the forum, @Murray
I fixed an SD/A 390t and posted a thread about it.
In one of the last posts I added to the thread (scroll down) I noted a video I found of a Denon DCM 320, that showed the internals of that Denon to look identical to the guts of the SD/A 390t. Almost perfectly - EXCEPT Bob Carver added the tube buffer stage from the SD/A 490t in the space that was open in the Denon unit. Links to those YouTube videos are in that thread.
I don't know anyone in Canada to refer you to - but a qualified tech that has experience with CDs should be able to fix it - and, yes, they are hard to find. The Service Manual is also in the Library here on TCS - and it is quite good and informative. Any shop you go to should reference it (download it for FREE).
Have a look at my thread - see if the symptoms you have are the same..., they often are. I have fixed several of these, now, with this same fix.
Good luck!
That thread is here: