I am looking for repair on the xw8000 mobo, any ideas who is good??

Well if you are looking for a local shop we have no idea where you are from.

Even then we are still at a loss and need more information.

Typically you do not repair a motherboard you replace it
There are circumstances where say the plastic on a port is damaged or some other part that can be replaced and re-soldered back in, but since you have in no way said what is broken we do not know if this applies.

If it is not something repairable then you either need to send it off to HP or have a local shop replace the motherboard. Typically it is cheaper and easier to just get a standardized motherboard from ASUS, Gigabyte, MSI, etc then to actually pay the steeper prices to get the OEM HP motherboard which likely has less features. Now sometimes the OEM HP motherboard has proprietary connections and thus is the only option.
 


 
I am from Marion,IL, The mobo is from a HP server/workstation XW8000. HP no longer supports parts. and a mobo is $300 & up depending on time of day. I am looking for a mobo repair center in US. It is a special mobo for that case.
 
Is this the computer in question: http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c00347879

If so that is a 15 year old server.
On a brand new board no one really replaces damaged items like northbrige or lan chip because the parts plus labor really quickly surpass the replacement cost, not to mention the large risk of something going wrong during the de-soldering process. On something as old as that motherboard you are not even going to find replacement parts as production of those parts would have stopped 10 years ago.

If this is some legacy computer for non-windows 7 compatible hardware that is detrimental for the business, then you have to understand that really expensive replacement parts are par for the course. It is simple supply and demand and at this point supply is just above zero. Thus your only option to get a motherboard that will work with your current hardware is to buy one of the ebay ones.
If this is the scenario where your business function is reliant upon some legacy hardware-software then you ultimately need to research and migrate to a modern solution. The underlying question is not how much the upgrade costs, but how much money not doing the upgrade will cost in the event of complete equipment failure.

If your 15 year old server is just in use because of upgrade costs, and not because you need windows xp to support your legacy hardware/software then just replace the server At this point the cheapest desktop in Walmart could do laps around that dinosaur, so dropping $300 for a used 15 year old motherboard in this circumstance is just sillyness.

I know that this is likely not the advice you wanted to get, but this is my professional advice that I would give to any client/employer.
 


 
The machine is a 2003 model, that up to this point, has outlasted many others. As you mention, parts are getting pricey and hard to find. I would like to find a identical configuration mobo that would fit the case as original. It is a TYAN mobo, Socket 604, Thanks