Re: Door check strap in Repair Manual
I have not had anything done to this part, as far as I know. There was a plate somewhere replaced due to rattling, but it was not described as the door check strap, I understood it to be a cracked striker plate, and I didn't see it.
Looking at the TSB, the "Door Check" itself is mounted by two studs and nuts. The spot-welded part is the "Door Check Mounting Panel", which is a part of the sheet metal of the door structure - that I would expect to be welded. The "cup" which is welded is the larger sheet metal panel component; the part which is bolted into it is a box-shaped component inside the door, from which the "strap" itself protrudes.
I went back out to our Sienna to look with this extra understanding, and confirmed that the panel (which could be called a cup) is still firmly spot-welded in each door - there is no evidence of any repair or replacement.