Boss VF-1 Effect Processor

Several months ago my house got hit by lightning destroying all my 
PCs, lots of networking equipment, and phones.  The only damaged 
piece of my music gear was my VF-1.  The unit still powers on and 
operates properly, just it seems the AD converter was blown since it 
gets no audio input from the L+R inputs or the guitar input on the 
front.  While I'm not absolutely positive the output works, it seems 
to my ears that some noise can be heard coming out the outputs that 
respond to parameter changes (and if it was just the DA converter, 
the digital out would probably be working).

I opened the unit up and looked around for blown chips or if there 
were any noticeable marks from where lightning might have hit, also 
checked to make sure the inputs were still properly soldered to the 
unit - and everything looked perfect.

Anyone have any idea what the costs might be to get the unit 
repaired? (insurance bought me another one and I still have the 
broken one and would like to have it repaired if the cost wasn't too 
high)

Thanks,
Brandon