Corrosion

Battery replacements ? Charging resistor ?

Patching traces

Make sure to use the appropriate gauge when patching power traces, AWG 35 won't allow 1 amp for long...

• "Kynar" wire: Great. Get a good quality spool (high-temperature plastic).
• Magnet wire: Good, easy to salvage but can be hard to solder.
• Telephone wire: Can do the job for a few traces, but very rigid (and ugly).
• Paper clip: No.

• Tape: If temporary, why not. Might leave sticky residue.
• Hot glue: Good, just don't make a mess and don't apply it to chip pins.
• Nail varnish: Good, can take a while to dry. Easily removed with acetone.
• Random glue: No, probably won't stick or will stick too much. Can also eat the board up.
• Epoxy glue: NO. NEVER.