You probably have a blower regualtor problem since you have found the proper actual value to check and the values were appropriate. other than doing the checks in real life at the regulator, that IS the test.
The test you found from my article came originally from the DM (diagnostic manual) and as you noted there are different instructions for every chassis and different actual values. The actual values set-up procedure is the same for all models although the values themselves vary.
I don't have a copy of the DM handy to look up the 140 fault procedure. I never use it so I don't have it memorized. I do it with the scanner if I see the need. If you have the time and wish an education you should pay the $18 and subscribe to the MB technical website for a day (
www.startekinfo.com ). The DM is there and rather easy to manipulate. The wiring diagrams are also there in color with links to Starfinder (parts locator), and other valuable references. Also through WIS.net such info as parts removal and theory of operation can be found, plus service bulletins.