Your Jayco Owners Manual also provides step by step winterizing. It really makes the process go smoother if you have a helper. M & I use our cell phones. I run the pump from the AF bottle and she opens/closes faucets one at a time.
Like mowdoc said, look on the Precept Owners Group forum for more details.
Darrell, Mary & K.C. Toller Mix
In our hearts: Goldens, Tess & Jericho
'15 Jayco Precept 31 UL "Bertha"
'13 Wrangler Sahara...AKAFUN
Roadmaster base plate
Ready Brute Elite towbar and brake combo