If Beavis' suggestions above don't solve the problem, contact CC Poon over at Monarchy. He can refer you to someone locally ( if qualified ) or make arrangements to have you ship the unit back to him for repair.
As a side note, i am REALLY surprised at how many people are willing to take their "pride & joy" to someone other than the manufacturer or a VERY reputable repair facility. Many "repair shops" use generic replacement parts that compromise the performance and integrity of design. If you want to maintain the performance / sonics of the components that you have, consult the manufacturer as to who is qualified to repair the units. "Gadget Repairs R Us" may be close, but whether or not the unit is as good as it was before they worked on it is another matter all together. Sean