Tracy messaged me privately:
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"Unfortunately it's been going on for a couple of hours, so it seems to
be some type of extended disk check? The front console is flashing as it
shows the scanning disk message with the numbers listed after (i.e.
Scanning Disk 7331 ) - again as a rule do not like stopping a disk
check, but am concerned for the length of time this is happening."
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That does seem excessive. Does the number of the track it's scanning keep counting up? Does it start over again?
You can stop it by pressing and holding the STOP button on the front panel until the word SAVING appears, wait until that changes to the clock. If that works, then you can investigate if the unit is functioning properly in other respects.