Harry11

We Have 2000 Maxum scb 4600 Been having bad smell in the holding tank area, but now the smell travels true any hole and now have bad smell in the cabin, bedrooms and bathrooms, I bought and used all kind of treatments, powder , liquid etc, u name it,
Changed the filter twice, vent is open,did presure test for the holding tank, have no leaks, lines are very clean, heads are being used regularly vacuum pumps are working great
I use the boat a lot, I am in California, MDR
I was told to change the lines, smell is so bad I am thinking even to change the holding tank if I can take it out,I am ready to do the work just to get rid of the smell
Any advise will be appreciated
Thank you in advance