If you decide you want to try those things, here are some links about how to access the clinical menu on ResMed machines: http://www.cpap-supply.com/Articles.asp?ID=130 http://www.apneaboard.com/CPAP%20Adjustment.htm Brenda's post: http://www.cpaptalk.com/viewtopic.php?t=22776 My post: http://www.cp...

[quote="Velbor"]Two aspects to the "age" of a ResMed machine: the first four digits of the serial number will give the year of manufacture, but probably more important is the number of hours on the blower. That can be found in the Clinical Menu, under Servicing information (not to be confused with t...