Quoted from DCFAN:Here it is if that is what is wrong:
http://www.marcospecialties.com/pinball-parts/KBPC3504-L
https://www.greatplainselectronics.com/products.asp?cat=172
Part Number: GBPC3504L
Bridge Rectifier, 400V, 35A, Lug LeadsBridge Rectifier, 400V, 35A, Lug LeadsManufacturer: Diodes Inc or Fairchild Semiconductor
Price: $2.75