I just removed both of mine a couple weeks ago to replace the impellers. If you're sure all the screws are out -- some heads can get buried in the carpeting -- then just pull! (My starboard rear panel also has the shower hookup.
"For every complex problem there is an answer that is clear, simple, and wrong." (Henry Louis Mencken)
2005 X2, Viper Red, MCX, Acme 1285, PPass, rear 750 sacs, KGB, IBS, Bennett Wake Plate
(previous) 2001 X5, 1991 TriStar 190