Keep it vertickle for quite a while if you haven't already done so, then open it dead carefully before decanting.
I may well be teaching granny to suck eggs here, I appreciate it.
I used to have to do "Taylor's crusted" on the fly, we had a special wooden frame and a special double threaded corkscrew to keep the deposit in place.
'83, I was all of 28 then!
We love port 'ere!
And yes, my ex s-i-l used to open a bot and throw the cork away as he knew we would drink the lot. "We" being him and me after the others had had a wee glass.