I have this same problemWhen mine started having the efi circuit problem I decided to open the box and attempt to repair it.
It is a bit of a pain to open and I found the best way was to dremel out the retaining clips. The problem here
is that now it has no way of securing the 2 halves together.
After dissecting the assembly I'm quite surprised that there aren't more issues with other fuse circuits throughout.
Quite a few are loose to the point that I could see some higher resistance occurring and potentially burning out the contacts.
I went through all of the terminals and closed the gaps. I swapped out the EFI fuse terminals with some of the unused ones in
the box, and followed it up with some solder.
When reassembling the unit I first used epoxy to secure the halves but before it had time to set-up I decided to go another
route incase I needed to go back in. I was able to use short 10mm screws and secure the halves through the sides where the
original retaining clips were.
I am satisfied with the results since I was able to retain the original configuration and has remained trouble free.
Just an fyi to those questioning @medtro's solution. It does not supply constant power to the circuit. It operates much the same
way as the original layout. You can build your own and test it. The key has to be on to supply 12 volts to the "jumpers" fused lead.
Key on will energize the circuit and the relay.
Do you have pictures of clips. would like to open it without dremel
thanks