Today my friend William Willard showed me how to change the 2 transmission filters on my MH3000 Allison transmission.
As it turned out, the work was not difficult, and I will be comfortable doing this some other time if needed. Most difficult and time consuming part was to scrape the old gaskets off, and that takes no brains - just elbow grease
The filter change allowed 1.5 gallon of Transynd to escape, so we drove to the Allison dealer W. W. Williams in Phoenix and bought 2 gallons. Great price - just short of $75 all inclusive for the 2.
Again - thanks to Bill for yet another RV tutorial.