I use a guy called Ed at Northland Loudspeaker/Professional Audio Repair. He's not quick, but then no electronics repair shop is (at least, not in my experience). He seems to do more speaker repair than anything. You could also call the Good Guys, who are also very capable. There is at least one more place in town, but I don't have the list I keep at the shop in front of me.
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"Cowards can never be moral."
M.K. Gandhi