S-Video jack gives poor connection

[jdavia]

A can on spray cleaner will not hurt but I don't think it is his problem. I too have MTU's laptop and the S vedio plug comes half way out of the socket very easily if the computer is moved. You can remedy this by making the plug egg shapped very slightly so it fits more snug in the socket.
Normally I don't have that problem because I keep all the componets hooked up on a cart that I transport them with. The plug gets loose from constantly plugging and unplugging it.
The repair man is probably right. You can buy another connection cable easier if you damage the one you have.