You have to get to the inside seam tape where the failure is. Two ways to do it. Peel strake, outside seam tape, seam and inside seam tape find the failure, and rebuild. The other is to slice the boat open wherever your best guess is and go in from the slice looking for the inside seam tape failure. Likely you'll see a wrinkle in the tape or find it loose. One of the problems is that just because its leaking at "that spot" from the strake, that may not be where the inside seam tape failure is. There is a "channel" created and air can run the channel until if finds the easiest way out. Could be 3" or 3'+ from where it is leaking out of the strake. Until you find where the inside seam tape failure is, you can't fix it. If potentially peeling apart 3' of seam doesn't sound appealing....
Another option if its a super slow leak, is to use the interior sealant. If you go that route, I would recommend the product that Inflatable Tech sells over the NRS or god forbid, West Marines peanut brittle.