The instrument repair / restoration shop I used to restore most of my L-5 instruments in no longer is business. I have also used the following two instrument shops to restore a few of my L-5 instruments and they both have done excellent workmanship. They also communicate very well through email / phone and have done work for other warbird owners.
Instrument Overhaul of San Diego, contact is John Dors, 619-449-5565
Otto Instrument Service, contact person is Evan Greenwalt 909-247-2622