Help! We brought Turky home yesterday and he's doing wonderful so far with the bathroom aspect. HOWEVER, he's still marking!

It's always the same spot. The entrance between the kitchen and great room. Ever since that one night when he was acting all goofy(I posted about this last winter...I'll see if I can dig up the old link a little later in case some of you need back ground on that). Now, he still wants to mark there.
Here's the thing...Turk never had an issue with marking until that night which happens to be a good 6-7 weeks after his laser neuter. This is what has me baffled! Isn't the neutering suppose to help stop marking behavior?? Like I said, he never marked before the procedure, so this all has me stumped and very frustrated.