Slide Water Leak

[countrypair]

I have a 2007 Fleetwood Terra LX 32K ON A Ford Chassis with 2 slides. I discovered a leak in the corner of the livingroom slide right next to the shower wall, on the dinnette side. The slide has been closed for the past 2 months, but when I opened it up I found the wetness in the corner. I checked under the shower & everything was dry. Outside the corner of wall where the slide goes in there is a verticle trim strip that was wet at the bottom. I've checked the entire length of the strip & saw no evidence of a leak. I feel the water has to be coming in at this corner, but I don't know where! Has anyone else had this problem or something similar?

Thanks for any feedback.