Originally Posted by Bossman
When I do the repair I intend to replace the neutral bus bar. Is there a paste that I can coat the wires with to prevent oxidation of the wires ?
Oxidation is not the problem, it's galvanic corrosion that causes these type issues. Oxygen can't get to the interface of a good connection because it's a gas tight environment. But dissimilar metals react to each other and many poor quality electrical devices have designed in issues concerning the types of metals and finishes they use for connections. A copper wire on a copper bus bar with a copper plated screw is the best. But a copper wire on a plated bus bar and a steel screw is often seen in electrical devices. The only thing you can do in the latter case is keep an eye on it.
Can you accurately describe the metals and platings that make up the connections? If so you I can show you how to look up the effects of incompatible couples in electrical connections.
If not then get an electrician to fix your issue and ask him/her to follow the code.