That one's easy to "restore". There's a special tool that's used to burnish the contacts where the panel lights, idiot lights, and instruments make contact. It's sold at Walmart- - - - -called a #2 pencil! There's just enough abrasive in the eraser to scrub away the corrosion to get a good contact, and the areas between contacts don't have to be cleaned at all. If a conductor has lost its grip on the circuit board, Elmer's waterproof household glue or even super glue makes an excellent adhesive to stick it back down. Broken conductors can be repaired with a strand or two of thin copper wire and a soldering iron, Just burnish the broken spot, lay a short bare wire patch down, and quickly solder the wire to the conductor strip.
You can fabricate the bulb socket contact strips from brass shim stock and a pair of manicurist's cuticle scissors, glue them into place, and glue wires to the circuit boards to replace large sections of the missing foil. Electrons don't really care if the conductors they're using are round or flat!
Jerry
