Do the controls on your Defender arcade game not work properly, or not at all?? Are some of the buttons registering as stuck on? Do you have to wiggle around the ribbon cable, or constantly reseat it to make it work? If so, then this is the service to get your games controls working again as they should. After purchasing this service, we will forward you our shipping address to send your non-working "control panel input" PCB to. You pay one price and that's it, no hidden charges or fees. Here's what is included with this service:
1) Your board will be repaired back to working status
2) The original input header(often a cause of poor contact) will be replaced with a new one.
3) The PIA chip will be removed and installed into a new dual-wipe IC socket. This is in case you have issues in the future and this IC is suspect, you won't have to desolder it in order to replace.
4) A brand new ribbon cable will be installed
5) We cover the return shipping (U.S. only)
Everything remains as it was from the factory, only with newer parts for reliability. 
We have been in the classic video game business since 1991 and service the PCBs of most major operators here in the New Orleans area. If you have any questions, please ask and we'll be happy to answer them. We will also be adding our main PCB repair service for the Williams classics like Defender, Robotron, Stargate, Joust, Bubbles, and Sinistar in the near future. Thanks for checking us out!!