Screech -- Soon-to-Be Homeless Porn Star

"Saved by the Bell" actor Dustin Diamond may have to do another XXX flick, because he's about to lose his home.

Wells Fargo Bank just filed legal papers, claiming Screech is more than $290,000 behind on his mortgage.

The bank wants to foreclose on the property, located in Ozaukee County, Wisconsin.

If this sounds familiar ... Diamond avoided foreclosure back in 2006 by selling "Save My House" t-shirts for $15 a pop.