Bally mpu previous repair question

Grbgemen

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Recently acquired a few MPUs from an operator. These had been sent off to someone who replaced sockets/neutralized acid/replaced corroded parts.

I noticed that all of them have some sort of modification in the lower corners(where corrosion usually is). A few components are missing and a resistor is oddly placed. Looks like all the boards are the same in this area.

I snapped a photo. Can anyone tell me what's going on?ImageUploadedByTapatalk1355715415.779325.jpg
 
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