Removing/Replacing Aluminum Fascia Trim

Description: Five year old vinyl sided house with J-channel abutting 'white aluminum fascia 'trimmed' areas which surround the sides and tops of both garage doors. This aluminum trim is likely covering 2X4 rough studs, and appears to be taking water underneath (despite having been caulked between J-channel and alum. trim) as I've removed fungi from between the J-channel and the trim on a couple of occasions and re-caulked. Aluminum trim also appears to be separating and working its way out from under J-channel at top of doors. In fact, I've seen neighboring houses that have done exactly that. I'd like to remove the alum trim before it becomes a bigger rot problem, but I'm thinking composite material is not a good solution as the alum. covered underlying wood is thicker than the J-channel edge (protrudes out by ~ 1/2" or more) and covering all sides/edges watertight-- especially adjacent to the J-channel edge -- looks impossible. Any recommendations? TIA!!
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Go to a siding supply house and ask to see what they have, on option might be...
The lineals depicted here (right below the big picture), they are like a wide thick J-Channel for trimming around windows & doors. http://alside.com/index.aspx?pager
Don't count on the aluminum being easy to remove. I've seen it installed with an extra bend that goes behind the J-channel. Check it out before you go forward.
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