This the parts catalog that can give us some idea of where things run and we can get an idea about the lines running to and from the pump to the slide rams.
https://catalog3d.winnebagoind.com/menu/Parts.htm
This is likely not what you have but an example.
I got to this by looking at the "EXTERIOR SLIDEOUT INSTALLATION GROUP"
You may need to change to the correct RV, though, so consider this only an example!
Click this snip to see better or go direct to the correct drawings!
It might not be a terrible price for the part if it is just one of the short lines or some fitting but the labor looks like it might be a problem as parts of the slide may have to come off?? And then the question may be whether to only replace one line while there or do all to avoid the big labor of coming back again later??
How far to trust hoses that are getting near 25 years old?
__________________
Richard
Why no RV year, make and floorplan on MY signature as we suggest for others?
I currently DO NOT have one!