Mike
Don't be afraid of ebay, just look for a reputable seller with excellent feedback. But keep in mind the ECU may not be the problem, the failure of your pink 561 ecu usually results in a no start and yours is still running.
If I was running a pink 561 I would have a known good 951 on hand for a spare or just replace the 561 now.
This is a very good deal on one, I have no affiliation with the seller. https://www.ebay.com/itm/Volvo-240-Bosch-Jetronic-ECM-Engine-Control-Computer-91-92-93-Used-ECU/312136765258?hash=item48accd0f4a:g:5FYAAOSwHPNa~gGt
Follow Art's suggestions and see if you can get it running as it should.
Dan
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