C70. Going to have free ETM clean/upgrade.Any need to worry?

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Hi guys.
Just bought a volvo c70 2002 2.0L with 42K on th clock.
I currently have no problem with the ETM, but rang up a volvo dealer (Stratstone in Aston, birm) regading general position with ETM problems, as it seems prominant by volvo owners.
They told me that its a problem, but I can bring mine in for a FREE ETM clean out and software upgrade which will take 1 1/2 hrs. I accepted the offer, but i'm wonerding if I should, as i do'nt have any problems with the ETM and have not got the ETS light flashing.
So a couple of Qs really, if some one can expertly advise.



1) Should I get it done, as prevention may be better than cure, even though I do'nt have the problem (or is the problem there, but invisible?)

2) What exactly consists of an ETM clean. What do they do exactly

3) What is the software upgrade and what does it actuall fix/prevent

4) Is it safe to do the software upgrade and what components will it affect

5) Will it improve car performance/fuel consumption/handling and if so, how can I tell/feel/see.

6) Does it take 1 1/2 hrs in reality and can they be trusted to do it right,
and may the clean/upgrade trigger the ETM issue later or other problems

7) Are Volvo 2.0L 2002 models less prone to ETM problem, or was it more prominant on older models.

8) Most of all, willl it save me from the dreaded ETM warning light and for how long? !!


Thanks to all, for expert advice