Sears Keggerator tower addition

I've had my Kenmore Keggerator for several years. For Christmas SWMBO got me a double-tap tower since I'm going to start kegging my homebrew shortly. My question is....can I drill another hole in the top and add the second tower (to keep the original for a total of three?). I guess I should make sure that 3 cornies will fit first (they arrive on Monday). Is there refrigeration lines in the top? Anyone know or have experience with this fridge? Thanks

I remember seeing a thread on a kegorator build where they took (I think) corn starch and water made a slurry and smeared it on the top to find where the coolant lines were.
If anyone could help find this thread please post it because 3taps are better than 2.

https://www.homebrewtalk.com/f35/sanyo-4912-kegerator-conversion-19762/?highlight=sanyo+4912+conversion

I believe this should help you out Good luck!

thanks....I'll have to try that.