Partial connectivity mappings

Hi community. I have a sv3020 unit, iscsi attached to 3 hosts. In dell storage center, under each server and each volume i have 6 mappings listed as 'down'. I'm pretty sure these were from the 1gb iscsi esxi connections we used to migrate from old hosts. I can't see a way of removing these and, being a novice on the storage center gui, I don't fancy trying much this lovely 'read only friday'. The san was fully rebooted, inc controllers, last weekend but the system has not re-evaluated the live paths and removed the dead mappings. any advice on how to remove? Thanks in advance.