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Jim,
The avionics access door leaking problem has been the subject of prior threads, I believe on this website or Peters, where it was covered extensively. You might do a search first.
While you have the covers off, inspect the chain connecting your yokes for rust... which is a tell-tale sign of probs. You might want to shoot a little LPS on them as you get them rotated both directions.
Using a mirror look at the underneath side of the small cups that are attached and sealed with the greenish-gray putty stuff that Cessna used at the factory when they built the plane -- I forget the name of it. These are beneath the receptacles and we've seen them loose on several 337's, letting water in, or in the case of the P-models, a nice air leak. A quick fixit to seal out the water is to use a good grade of clear silicone, although the original stuff would be best. In either event, it's a messy and rather time consuming/tedious job to get each one of the cups sealed around its circumference. Perfect weekend project.
If the lip of the rubber seal isn't sticking up like it should so that it has some compressibility, that could lead to leaking water and air too, in which case you might consider replacing the seal... or perhaps laying down a bead of clear silicone on top of the rubber and let it set-up overnight without putting the panels on... this will give some additional height to make for a better seal. But DON'T lay a bead of silicone down and then attach the panels, or you'll play hell getting them off and may even damage the panel in trying to.
Hope this helps.
SkyKing
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