Reinitialized the control to get a stuck arm fixed??
Anyway, not all help but some....
Machine takes a T#M6 command. In fact, you can also call the next tool in the same line like this: T#T#M6 The first T is spindle, the 2nd T is next tool or ready tool.
I can't hardly remember a M32 control but there also should be a Maintenance button on the keyboard with some ATC function controls. Should be able to swing the arm back from there as well? Otherwise, I think theres a solenoid you can force the plunger to swing the arm back.