Note: The field repair assembly includes one disk drive, the electronics planar, and the 5-1/4 inch form factor cage. The remaining good drive is removed from the failed disk drive assembly and installed in the field repair assembly to create a complete dual-disk drive assembly. If saving data is critical, try installing the faulty drive in place of one of the two good drives in the now-complete field repair assembly. If the faulty drive operates satisfactorily, the problem was probably in the electronics planar.