XK8 chain tensioners

[clayton]

After reading of Bruce's problems with chain tensioner(s) for his 1999 XK8, I queried the local dealer and learned the following:
 
It's not a matter of "If", just a matter of "When" for failure of tensioner parts and expensive damage. However, if parts are replaced before failure, it's not too bad, less than $1000, parts and labor. Furthermore, there are some special alignment tools needed, such that an owner should not do the work. Five tech hours and abt $350 parts. I will have them do that.
Thanks
Clayton

[craigguy]

If it is known to go wrong, shouldn't the manufacturer pay for it? What do you think?