I've been told by someone who took one apart for fun that the old (non-digital) ones are some quite cheap and replaceable components sitting in potting resin. Mind you, he creates control boards for CNC machines including the PCBs for fun.
However, he suggested that getting the potting resin off took as much of his (payable) time as a new unit. So if you can do that bit it might be repairable and worth it.
As for damage, it depends why the unit went down. It's possible to get big back currents set up if the earth wires come adrift (several units fried that way in the past) and if you connect the battery the wrong way round (BTDT) but also simple things like connections or the buttons failing, water in the box and so on.
One unit was condemned as 'failed' because the leads in the loom had cracked under their insulation. Fixing that repaired the unit.
But you need to get your tame electrical circuit expert to check it out.
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