Jack the front of the sled up, and check for wear/slop in the ball joints, tie rods, A arm bushings, spindle bushings.
Check ski wear bars and ski condition while your there.
Loosen the track and check boggie wheels/bearings, they should spin nice and free with no roughness or noise. For the rear axle wheels, it's usually easier to pull the wheel, or skid out.
When re-adjusting the track tension, don't forget to check the track alignment. I usually put the sled on a track stand, then spin it up to about 15-20 mph and then let it coast to a stop. The track drive lugs should have the same distance to the rail on each side.
Put new batteries in the beacons, test them, and take an avy refresher course.