Q1.. If the EEC looses one of the EPR signals/sensors ie P2 or P4.9 then the EEC will revert to Backup N1 Rated mode, ie with some protection against overspeed. The crew action would be to follow up and select the N1 pushbutton for that engine as well as the other to keep them in the same mode together. If the EEC looses the T2 temp signal it will revert to N1 mode unrated, ie with no overspeed protection, so be carefull if you need TOGA