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I was going to post check for puking caps on the opto boards... so make that 3rd as that is what happened to mine.
The electrolyte looks like it may have just opened up the 12v trace by rotting it out. 12v comes in the connector on right. Goes through the top diode and then that 100uF cap.
depends on your soldering tools and skills and want to screw with it. It doesnt look ruined to me.
Pull the cap off and top two diodes. Scrape off all the crud (carefully electrolyte is probably nasty stuff). Wash with a solvent (maybe before scraping or in the middle of). Inspect for broken / rotted out copper and patch accordingly.
I think its just going to be a busted trace around the the cap. sepcially if the LED on the opto board is out and the 12v opto fuse is not blown.
Oh.... if the cap puked on this opto board I wouldnt trust the caps on any of the other opto boards. specially if they share the same cap brand/value.
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