location of main drain pipe

[sks24]

Thank you for allowing me to join your forum. I need help determining the location of the main drain pipe which goes from my main drain at the bottom of the pool to the pump/filter. The reason for my asking is that I am all but certain that I have a leak in that pipe, and I would like to try and repair it on my own. (If I cap the main drain, the pool doesn't leak.)

I have both photographs and drawings/diagrams of my pool, and would of course be pleased to post them upon being enabled to do so.

Here's a link to a (shared Google doc) diagram of my pool:
https://docs.google.com/drawings/d/1...it?usp=sharing

It seems like the main drain pipe would run out from under the pool to either the east or the west. If it needs to run under the skimmer, then it would run to the west. I hope that's not the case, because there's a concrete pool deck which would run over the pipe if it runs around the pool tub on the west side of the pool. If it runs out to the east, the access to the pipe will be much easier, as the deck would not cover much of the the drain pipe, and I could easily dig under it safely.

Thanks in advance,
Scott