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Evasive leak

Q: Should we pay licensed contractor to continue to find source of leak or hold him to the work already done to find/fix leak? We have water leaking inside the house at the top of a new slider installed by same contractor. Leaks only in driving rain and will leak hours after rain stops. There's a metal awning over slider. Leaks over stationary door but now is leaking over moving door. History:Caulk outside and inside of new slider showed cracks. Same contractor re-caulked three times (slider frame, including screw holes of awning bracket over slider). Time 3&4 had him use Lexel caulk. Before new slider, water collected underneath the floor board at the foot of old slider. The wood floor inside showed water damage. Hired him to replace the slider and fix water damage. With the installation of the new slider,saw visible dry rot in subfloor and floor joist. He replaced floor joist and patched subfloor. We asked him to find the source of leak. He proposed removing siding to find source. He found 2nd floor window trim rotten and identified source of leak to to be a joint in the siding above the 2nd story window that fed water along the window, beneath siding, running around slider and collecting at the spot of rotten floor joist. We paid for the replacement 2nd story windows above the slider (three total), window trim, and siding. He says he's done all that he can do and that leak must be where siding meets the trim boards at the top of the house. He ruled out roof and 2nd floor shower as possible source. Says, siding only goes under trim board by 1/4" and driving rain is getting under siding and exiting out slider. What is fair for both of us? Pay him or hold him to prior paid job?

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