You won’t be able to tell at this point if it was, in fact, done at 105K as recommended. Tough position. It’s an interference design so if it does slip or break there’s a good chance you’ll be shopping for a new motor. If it seems otherwise well maintained, I’d look at the $850 or so as cheap insurance rather than pulling the motor all all the possible problems that naturally come along with that (connections not going back together quite right, chasing grounds or shorts, not knowing the history of the motor you’re buying, etc). IMO anyway.

Typically the water pump is replaced when the TB is done. If Acura did the job, ask that dealer to pull the invoice. If they didn’t replace the water pump, meh, what are you going to do now? If they didn’t do the service themselves, I’d ask for a writtten statement or ask to see a receipt that it was done. I don’t trust dealers and I am just assuming this service manager is telling you it was done because they don’t want to do it. Once the car is in your hands for awhile, or the TB goes in 25,000 miles, not their problem anymore. If the water pump goes bad at some point before 210K when the next TB is called for, just make sure to do the TB service at the same time since you’ll already be in there. I wouldn’t worry about just the water pump to be honest, if it goes at 180K mikes, as i said, just do the TB then and never worry about it again. I’d worry more the dealer is full of it, but that’s just my opinion. I figure any time after 300K miles it doesn’t make sense to do another TB service as so many other components are nearing the end of their service life, especially since I live in the salt belt in the winter season.