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Guessing, but the only visual issue that is immediately obvious is corrosion/arcing evidenced on terminal R6.
this pin configuration is a problem when any type of current goes thru it.mercury marine tried those small pins on relays that controlled fuel pumps and ign A voltage to injectors and such,they'd work for a couple of years then whacky things start happening.
fix was back to larger pin connections.I know first hand as my efi boat engines had the small pins.

good info OP,thanks for sharing.
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