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No expert here, but valve springs are internal, so I wouldn't see them as a cause. (unless it of course caused a major engine failure!)
That said, the various gaskets & seals that are replaced when the recall work is done may fix some of your leaks...depending where they are coming from (and whether those parts are dis/reassembled during the work).
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'02 Celica GT-S, '88 Celica All-Trac
'13 Scion FR-S (sold)
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