can't find the leak

[bandmbrown]

38" fleetwood bounder diesel pusher. the rear portion is a bath with a corner
shower. enclosure is a 1/4 circle glass with sliding arched doors.
i have a leak along the enclosure where it meets the floor on one side and a corresponding leak where the enclosure meets a door on the other side.
recaulked everything i can think of and still leaked. next took off the plumbing access doors that are in the angled corner of the surround and took a look at the plumbing.....dry. bummer. so..my only other idea is the drain. i take a good hard look down the drain and see standing water. now the only reason i would think i'd see standing water is if there is a p trap. but thinking since shower water goes into grey water...probably no p trap.
anybody help me out here!
thanks
bob

[Pete & Linda]

I would think the shower would have a p trap.

[damdannyboy]

The shower has a trap, mix up some food color and water pour and down the drain. if no leak is found, block drain and pour mix around drain to see if shoe is leaking.

[Midniteoyl]

Ya.. pretty much has to be the drain at this point.. if its a screw in strainer, I'd bet the gasket is bad.