JDM von Weinberg , Dec 27, 2010; 02:40 p.m.
Somewhere, it may have been http://www.exaktaphile.com/repair.html there used to be a discussion of CLA cameras that had been done, even by some seemingly reputable firms, that amounted to nothing but pumping in some lubricant. I can't find the site any more, but there are other warnings about scams in this area (e.g., http://www.zeisscamera.com/first.shtml ).
I'd be very careful and look very closely at the eBay ratings and history before I'd send it off to parts unknown.
The easiest sort of "CLA" for the Canon A series is to cure the squeek/chirp and this may be all a dishonest CLA would be - simply lubricating the mirror mechanism. This can be done on your own (e.g., http://www.paradesquare.ca/canon_fd/a_series_chirp.htm ).