I have researched your problem and have the fallowing for you to aces.
First, the
early production of these units, have had several problems and do not have a very good rating.
Second, if you have a product which needs a board, the least that you could
purchase the board for with shipping, would be $45.00
I have seen this unit
advertised on Amazon for $75.00 New.
It would be may
opinion that a New unit for $75.00 would be a better deal than replacing a defective part and maybe still have the unit fail
afterwords.
Below, I have left you a site on Amazon where you can purchase if wanted. You would have to go directly
thru Royal for the replacement parts for that unit and I do not believe you would want to take that road.
Thank you.
John
http://www.amazon.com/gp/offer-listing/B0001ZJREO/ref=asc_df_B0001ZJREO972746?ie=UTF8&condition=new&tag=dealtmp3681-20&creative=380345&creativeASIN=B0001ZJREO&linkCode=asm