All EICAS messages have a corresponding checklist (except some newly introduced EICAS messages on checklist usage itself, like "CHKL INCOMPLETE NORM", that indicates that a normal checklist has not been performed at a time when you are expected to have done it, such as Before Take Off Checklist when you are lined up on the runway), anyway.....
Some non normal checklists have the [] in front, indicating that some crew action is required and pressing the ECL button would bring the non-normal checklist up on the MFD. If you have several active EICAS with [] you will see a list of these checklists on the MFD and you will have to select the most important checklist to perform at that time. For example if you loose all of the hydraulic fluid in the center system you would get these on EICAS:
[] HYD QTY LOW C
[] HYD PRESS SYS C
Here the second non-normal checklist is the more appropriate to start with. So you need some system knowledge. The checklist for the low quantity has no procedural steps only notes, but these notes are important so it still has the [] in front