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Do you happen to know the type on the MS9 PCB?
Like MS9A or MS9S?
The official Nanao sticker was missing from mine, but there was a handwritten one saying it was a MS9-29T
 
ms9-29t taito
ms9-29su sega universal
ms9-29a auto switching, found mainly in time crisis 2 japan build and certain model 3 cabs
there is another version I have seen but I forget the suffix

anyway your fault is down to bad caps although the la7837 may also be damaged
 
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