17 R4, exploded mhpc chip, will not power on

Best wishes for that search -- most shops charge for such repair by the hour, so you'll likely be investing at least a few hundred dollars to start -- and it takes very little for the cost of a repair attempt to add up very quickly.

You will want a shop that can guarantee a repair (which is usually good for 90 days) -- otherwise, carefully weigh the hundreds in repair vs. the hundreds to replace the board.