There are many things to consider in this case, which can be only confirmed by looking into the historical autosupport and case data for this system. Thats why I suggested to contact NetApp Tech support. However, from what you explained, I understand that either the ESH module B (on the bottom of the first shelf) or the backplane port on bay#3 (4th slot form the right) on that shelf may have a physical error. It can be as simple as a loose connection or as bad as a hardware fault. Since the drives are going to maintenence center, I am assuming a temporary transport error might have happened.
The first step of troubleshooting is to remove and re-seat the ESH modules and cables. But since you have an AT shelf, removing one of the modules will take half of your Hard disks offline, leading to a panic. So, as your service provoder requested, you need to shutdown the storage controllers, remove and re-insert all cables, connectors, SFPs, IO modules etc, and power everything back on. If the issue still persists, you may have to replace the ESH module, the Shelf Chassis, or both.
Get in touch with the service guys and ask them to help you in doing this. Make sure that you have informed the users, because this may need a downtime of at least 30-40 minutes I guess.
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