Hallo again and ty for your reply. I bought labbcables so I have tested all the coils and solenoids on the hopper, reel mech and release door handle with power. What i have not done so much on is the top unit so I just took it out of the machine to be able to do maintenece easier, see pictures of it outside and also the plug connections. Around one of the connections it is black so i guess there has been a short curcuit sometime. Basically the only thing that I have done on top unit is replace one broken switchblade on one of the coils. Gonna clean and check all the switches today. Let me know if there are some special spot you want me to take a photo of which could be interesting. It must be something in top unit that prevents payout and reset of hopper payout board. I do net get payout in coins or credit mode so it must be something here.

There wasn't a drive plugged in but also had this error occurring at the same time.  I am sure there is some relations between the two.

It's been awhile but I thought you needed H9.27 (SSSG-1490) to have the OS reconfigure the deck.

You are absolutely right.  H9.27 worked like a champ.  I knew I was close and just missing something simple.

New mobo for Atronic
$75 plus ship pp ff

2 mpus appear new and 2 distribution boards
$100 for all 4 plus  ship