This is version A:02, there is already version A:03 in this folder:

images/disk_utils/diagnostics/COMPUTER_CHECKUP.dsk

Use Locksmith Fast Backup to get a copy.

Boot the copy, it hangs after the splash screen.

Look at the code: why it "clean" the $1700 memory area?

Let's do a little boot tracing.

At address $1747 there is a nibble counting routine, it returns the
results in Reg.Y - Mem. $3A and Reg.A - Mem. $3B.

Digging more in the code and you will found that the "magic number" are
$29 for Reg.Y - Mem. $3A and $0C for Reg.A - Mem. $3B.

Use a disk editor, search for $20 $47 $17 - JSR $1747.

Found it at:
track $01 sector $09 byte $3F. Change to $A0 $29 $A9 $0C $60 - LDY #$29
                                                               LDA #$0C
                                                               RTS