That is a 12V TVS diode. If there are no other problems, and if your PSU is good, then the drive can be operated without this diode.
SMBJ12A, STMicroelectronics, TVS diode, 600W, 12V, marking BBE:
https://www.st.com/resource/en/datasheet/smbj.pdfIf you intend to replace the PCB, then you may face one complication. In addition to a mandatory transfer of the NVRAM IC (U5), you will need to ensure that the donor PCB has compatible firmware. That's because the "ROM" code is embedded within the MCU (U1) rather than U7 (which is unpopulated).
My approach would be to remove the shorted diode and then power up the PCB on its own. Measure the voltages at the emitters of Q1, Q2 and Q3. I expect you will find +3.3V, +2.5V and +1.2V.
Then measure the voltages at the capacitors in between the two coils. You should find -5V somewhere, unless the MCU has switched off this supply rail.
Edit:
If you have the appropriate tools, it would be prudent to dump the NVRAM contents to a backup file.