I went back out this morning and there was nothing but clear water. Previously it appeared to be hydraulic fluid, however, I put my finger in Antifreeze that had been mixed with water and did get the slick feeling.
Haven't winterized as we travel varying months of the year. We are in New Mexico washing clothes preparing for the next trip (tomorrow) to Indio. Not sure where it is coming from, but will watch it while it is under pressure.
Thanks for the responses.
I have a 2005 Adventurer, 38J. Next time I am in Iowa, I plan to go to HWH and have them do a complete check on the system. Did it on my 02 and did have to have all the hoses replaced also.