Leaky Windows

[GAP]

Forgive me for asking a question that has already been answered but a search on this forum came up empty handed.  The window over our streetside bed has leaked occassionally since we got the trailer.  Has been survivable but is a pain in the butt.  We are convinced the source is the window itself and, from previous postings, am guessing the butyl tape (or lack thereof) is the culprit.  Can anyone share the link to the blow-by-blow description of how to pull the window, replace the tape and reinstall?  

Much appreciated

Gerry