yes there is an update
yes there is an update.
do a search in the archives of old Fchat, the head mechanic from Ferrari UK (Malcom?) and myself had a discussion and answered this Q for someone within the last 5 months. It does involve an update, however I was thinking it was early cars, 89-90 (91?)...didn't think it extended into the later cars.
I have heard (never seen it happen myself) that the early chains can break. Certianly couldn't be considered a common problem, but perhaps the invoice/car you have verifies it can/does happen occasionaly?
The thread we discussed this in contains part#'s and procedures I believe. Sorry can't remember the heading of the thread, something like 348 Cam Chain or Cam Drive.