Before you head to the stores in search of replacement parts, the first step in addressing connectivity issue is always cleaning. The 3-way toggle switch in my Fender Duo Sonic did not register any connection for the bridge pickup. I kept toggling while playing & after a few flicks, some contact took place but it crackled the signals, meaning, the switch is working but suffers from dirty contacts. A simple spray cured the problem but please use a dedicated contact cleaner for this purpose. Seen above- 3M contact cleaner. Effective but not a pleasant odour there.