Although I have never seen a discussion on it.
And if you searched and found nothing.

And because I am very much a fix-it-first kind of person.

I would say, IF you can get to the diaphragm and find the pinhole
it is certainley worth it to try silicone to seal it. Or tire patch stuff.

And last - where did you get that $140 price ?
Seems high, but I have never checked.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250