#1, yes it could just break (were there any symptoms prior - noise, slipping belt?)
#2 assuming you're replacing the belt tensioner again, they can last as long at 10 years + or just a few months - major factors being 1) quality of the part, 2) proper installation (all pulleys must be aligned or it won't last) 3) environmental factors (water, salt, sand, etc..)
#3 sorry, unless you have video of them working, you can't prove it..:
for fuel rail they just put retrofit rings & seals around the rail without removing the fuel rail from the van.. (unless they replaced the rail, but that would not fall under recall, AFAIK)
for clock spring, they don't tough the drive belt either..
It's possible that they messed with (removed) the belt to get better access to the fuel rail but they would not have screwed around with the tensioner...
#2 assuming you're replacing the belt tensioner again, they can last as long at 10 years + or just a few months - major factors being 1) quality of the part, 2) proper installation (all pulleys must be aligned or it won't last) 3) environmental factors (water, salt, sand, etc..)
#3 sorry, unless you have video of them working, you can't prove it..:
for fuel rail they just put retrofit rings & seals around the rail without removing the fuel rail from the van.. (unless they replaced the rail, but that would not fall under recall, AFAIK)
for clock spring, they don't tough the drive belt either..
It's possible that they messed with (removed) the belt to get better access to the fuel rail but they would not have screwed around with the tensioner...