Mark

Another one.... (longer duration of 6 minutes this time).

This one controlled the Manifold Interconnect Valve for the forward equipment cooling system.
     
     
  
Approximately every six minutes we get a "Valve" light on the cooling control panel and a "Fwd Eqpt Valve" message on EICAS.

We had to isolate this one with engines running. 30 minutes and a 1000lbs later..... we found it.

Please reference  rotate.aero/forum/767-21cooling/380-ata-21-58-equipment-cooling   for more information on troubleshooting these types of messages.
  

    
  
We tested the bad relay on a power supply after removal.