I have a Lowrance LCX 111C Chartplotter/depth finder that will not "see" the GPS sensor. I tried another sensor but no luck. I tried my backup chartplotter (Lowrance LMS 337C) and it works well on cables and sensor. Problem seems to be in unit itself. Anyone know a good repair shop? Had problems in 2009 with unit and sent it to Lowrance for repairs in Sept 2009 and didn't get it back until April 2010. Hoping I can find someone faster to repair it.