What he said, plus...
Swap the probes.
That should tell you if it is a probe or thermometer problem.
I keep several spare probes, not only for the 732 but my Taylors.
I buy them when they are on sale.
Seldom need one since I started Heat Shrinking the probe to cable junction, but nice to have around if I want/need one.
"Flirtin' with Disaster" BBQ Team (RETIRED)
FBA and KCBS Cook and Judge.
Former owner of a WSM, a Smokey Joe, a Charbroil Commercial gasser (junk), the legendary "StudeDera" and Sherman.
Now cooking with a Fast Eddy PG500
Proud Pellet guy cooking on real wood.