gingerbeardman:
Step 1: find the lever switch cable
gingerbeardman:
Step 2: trace the cable back
gingerbeardman:
Step 3: keep tracing that cable!
gingerbeardman:
Step 4: locate junction box
gingerbeardman:
Step 5: pull out contacts
gingerbeardman:
Step 6: do something about the oxidised contacts