thanks for the reply
think I've got it figured out, for now... Lol
no back flow since yesterday, think I may have had a blockage in the Joker valve, poo not all the way through syndrome
was looking in the owners manual today and am a little shocked with the stated holding tank capacity for the 27, only 5 gallons! although this spec is in reference to a self contained toilet, to me best understanding, this is not a self contained toilet
I've been quite bothered by the manuals poor details in many of the vessels systems when referencing a MkV
the tanks seems larger than 5 gallons, but hard to tell for me. If so, this is quite useless for any on or off shore cruising, pump out costs are not cheap!
as per your suggestion, I will perform some searches here as well will make a call to Rob at South Shore Yachts on the holding tank capacity
for now, I need another pump out!
'86 MkV #132
Fifty Point Marina