give that a shot. Prior make sure all hosts are multipathed and PowerPath/MPIO is working correctly.  LUNs will trespass automatically to SPA, they should trespass back to default SP after SPB is online. If not you can run this command to force them back to default owner:  naviseccli -h SPB trespass mine
Hi All,  A little background for you. This is a  CX4-480.  We had a faulted Standby Power Supply (Enclosure SPE SPS B.) This was repaired by our support company, however the fault persisted. They support company have said that we need to restart the Management Module for the error to clear. In this case Module B.  I am new to EMC products, can someone please advise the correct steps/best practice for restarting a storage processor please.  Thanks in advance  Will 
Restarting a Storage Processor