[skjepson]

We have a fiberglass enclosure for our shower in an extremely small bathroom. Just the last few days have noticed the shower leaking onto the bathroom floor. Since we have no basement and the unit is sitting on a concrete slab and the fiberglass unit could only be taken out by cutting it into pieces, would this unit have a drain pan? If so the unit would have to be cut to get to the drain pan. Where would the water be leaking from? Will I have to take this fiberglass unit out? If so, this will be a monumental task in such a small area. We only need to fix the water leak. Also could this have leaked into the wood anywhere? The only way I would know would be by taking the unit out or by going in from outside the house. I could only replace any parts of the drain by working on it from the fiberglass unit shower floor. We have no tub only the fiberglass shower unit.

[speedball1]

would this unit have a drain pan?

No, manufactured shower bases have no shower pans.

could this have leaked into the wood anywhere?

Sure, if enough water leaks out.
Most fiberglass and plastic shower bases leak because they aren't bedded well enough to prevent a little flex in the floor that ruptures the drain lip seal after enough time has gone by. Try this.
Take silicon jel and force it under the lip of the drain. Let it set up and cure and see if that doesn't help. Good luck, Tom