Autopilot double tap the disconnect button on the yoke. Most aircraft autopilots are like that, first disconnects it, second shuts it up.
Go Around buttons are the same, second press will silence any warnings from it.
VOR it should track if you engage NAV, as long as its selected - bottom left of nav display should say VOR1 or LOC1 not LRN1 (aka GPS).
Page 52 is the absolute service ceiling, what its saying is at 27,000 lb, 31,001 ft with a temperature 20 degrees below standard atmosphere (which equates to around -70*C / -94*F) the aircraft will no longer be capable of maintaining controlled flight. For a turboprop the engines have nothing left it can't go any faster, the angle of attack required to generate sufficient lift is equal to the stalling angle. For a jet its the point that you go any slower it stalls, you go any faster and the airflow over the wings suffers a supersonic flow separation, and it stalls.
Typically the saab is happiest in the 15,000-20,000 ft bracket. On a cold day she will go to F250 and technically that's as high as she is certified to go courtesy of emergency oxygen supply certification standards.
A few pages down you have the OEI service ceiling. that one it should theoretically get there.... eventually. Even then it's only guaranteeing a climb rate of 50ft / min. Personally i suspect you will run out of fuel first, that last 500ft will take 10 minutes to climb. If you have a look at page 118, climb data with the grear down. But the point is, climbing above F250 the performance goes off a cliff, starts taking 20 mins to climb 2,000ft under some circumstances.