centaur solenoid expander relay issue

robotype

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milano, Milano, Italy
the other day I switched on my centaur and noticed a constant buzz from the solenoid expander, infact kick to playfield solenoid was hot so I switched it off immediately. I took the solenoid expander board from another machine and it works ok, also the small chip on the pcb, the resistor and the diode are ok. my conclusion is the relay is faulty as it will automatically activate itself. is there a way to fix this relay problem without replacing it? maybe adding a resistor or a diode somewhere? any experience?
 
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thank you for the link! yes probably is dc, but the one I found says 100-120VAC and looks exactly the same...
 
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