I have sometimes encountered System Error 10738 trying to load Alex's combined Workshop/LOS image from his "LisaSourceCompilation" github repository.
Shortly after selecting the hard disk from the Startup From menu, it dropped into LisaBug showing:
Level 7 Interrupt
002E2E5C 6000 0150 BRA *+$0152
...
*** System Error 10738 ***
According to page D-13 (182 of 399) of
https://bitsavers.org/pdf/apple/lisa/workshop_3.0/Lisa_Pascal_3.0_System_Software_1984.pdfSystem Error 10738 = "Can't find a required driver for the boot device."
An odd error given that the image has already worked for me, and the boot device is the expected one (a ProFile on the built-in port).
I initially suspected some kind of hardware fault or image corruption, but found that after booting a different image then coming back to boot this one, it boots fine.
My new suspicion is that the problem is a power-up parameter memory (PRAM) state that isn't recognized as invalid due to a fortuitous checksum match, so it is not re-initialized with valid values. The retained "invalid boot device" value then causes the error.
To test this theory, I tried changing a couple of bytes in PRAM to invalidate the checksum, and after restarting it booted successfully.
I made the change in LisaBug (ie. immediately when the system error appeared, no need to restart and enter service mode although that would work too), then pressed the reset button.
The command I used was
sm fcc180 00ff 0055 00aa
It could be specific to my setup/hardware, and/or that there is an oddity in this image's (or perhaps a variety of images') boot code, or it may be a chronic Workshop bug... if I figure that out I'll append.
The Lisa's PRAM is a reserved portion of the static RAM on the I/O Board that is shared with the Floppy Disk Controller.
The 68000 accesses the PRAM as odd bytes in the range of FCC181 to FCC1FF.
The even bytes in this address range are not connected to anything, so writes don't go anywhere and reads will read an undriven buss (which may give random data).
Since the 68000 cannot perform a word read or write to an odd address, it is easier (less typing in LisaBug/MacsBug) to write a sequence of words to an even address rather than individual single bytes to multiple odd addresses.