Mike;
I don't expect you'll find a factory exploded assembly diagram, as it did not contain any replacement parts, and was to be replaced as an assy...but it is a simple enough assy that removing the cover will reveal most if not all of its secrets...
...and if it's only the "tilt lever" and not the seatback itself (which would involve the highly specialized spiral band spring), I expect the right tension spring may have broken (or if you're lucky, one of its end-hooks may have simply become dislodged). If indeed broken, that spring should be fairly easy to find a suitable replacement for (important parameters to match are physical size and wire gauge, such that replacement spring characteristics are similar to original).
I'd remove cover and have a look inside (this might involve removal from seat)...then you'll be much better informed...if possible, post some pix!
Good Hunting!
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