Defender ROMS

What version of the code do you have? Red Label? White Label? Blue Label? Green Label?

Have a look at MAWS:

http://maws.mameworld.info/maws/romset/defender

and you'll see for each set there is a chip with a '10' in the filename - it's that one which you'll need, but you do need to determine which version of the code that you have.

It's also possible that you have a dodgy socket for that chip, or it may even be a chip select problem, in other words another (soldered in) IC on the board could be at fault.

Still, worth trying the EPROM first then go on from there.
 
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