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Unless there is moisture or grease on the control circuit board, it's likely
failing membrane keypad.
There is a video here
showing how to remove a typical over the range control panel assembly in under 5
minutes.
For model GH7155XHS0, the exploded view and parts list are here:
Best to take into a bike shop, Internal hubs are tricky even with exploded views. The only source for these views I know of is Barnett repair manuals (most shops have them), but they do not provide free product from Barnett.
http://www.sheldonbrown.com/sw.html
There are a number of brands and models of 3-speed hubs you need to know at least the brand and model to get an accurate exploded view and better yet the year as they change. Shimano and a few other manufactures do make exploded views available for replacement parts but the barnett manual actually tells you "how" to fix it.
Rebuilding the master cylinder is relatively easy. Simply purchase a rebuild kit, take the master cylinder off the bike, Take the lever off and then most of the internal parts will simply come right out. With the internals out, you'll probably need to lightly hone the bore with a flex hone of the proper size. Lubricate the parts and install them just as they came out and reassemble the master cylinder. Then bleed the cylinder, hook up the brake hose on the bike and bleed the brakes at the caliper.
Sorry cannot help you. If it has more than 3 elements no one except an optical technician can reassemble the elements. Call Meade customer service. They may take it back knowing what happened????
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