Enable the trace feature on the printer, do a scan, stop the trace and download it, open it in Wireshark and see what is happening.
But SMB 1 would rarely be on 445, it is typically on 139 and uses Netbios over TCP/IP, and a firmware update would not be expected to fix SMBv1, because it is all but eliminated in most every OS (MS even killed it in Windows XP, years after they stated it would no longer receive updates)
But since you have multiple devices, and assumed to the same location they are all scanning or it would not have been worth mentioning, then you can wireshark a device doing a scan that works, vs this one that doesn't and compare them side by side (literally) on your PC. Either the 7970 is using different information to scan, or it is in some way corrupt, and will need to be altbooted to wipe it and start from scratch
