TJI is a brand name, but used as a general descriptor of manufactured joists. The have a top and bottom cord and a OSB web. A fabricated wood I beam in essence. If you look on the labeling, you can actually get the ratings as Wulf202 suggested, but those are irrelevant because if you don't know the load of the structure the beams are supporting, you can't reasonably use the rating as the additional load you can apply.
Sewer pipe...yep make them fix it. Jamnanc is even being a bit generous. I have bid those repairs between $4k and $12K and usually hit about right.
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