I slow death is not usually a hardware failure. That is an indicator of a thermal failure. But I suspect beverage residue. leading to a digital failure.
Did you try cleaning it with a spray can of high quality electronic cleaner? Give the circuit board and connectors a good spray and a gentle brushing?
I will be frank with you. Repair places do not do component level repair. If the circuit board don't work they replace it. It might just need a TLC cleaning.
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