Ecm damaged and blew efi fuse

A couple of years ago I smelled an electrical short and about 30 seconds later stopped running. After searching everything I found a blown EFI fuse, replaced it and the truck ran again. After that point my fuel mileage seem to decrease and now it's slowly gotten worse. So I removed the computer opened it up, and there's damage. I took it to an electronic repair store, that claimed they could fix it. A couple days later I reinstalled it, and it melted very badly in the same spot that had been repaired. I took it back and they were are still looking at it. It mostly ran well for 3 years.
Is there a possibility that something outside of the ECM did something to fry it.?
Cardone reman page say's a faulty solenoid could damage the ECM. But I have a MT. Any advice would be helpful.
It's about $800 for a used ECM, too much to risk. I'm a novice mechanic.
The repair service believed a capacitor leaked and caused the original damage. Damage shown

 

I was really surprised to see them cost that much for your truck. Makes me wanna go hunt down a spare. Will a 4runner one work?

 

No, only 89661-04310. I just ordered from Flagship One. I will be afraid to try it.

 

This looks like a failure (short) within your ECM that caused the EFI fuse to blow, so it was self-inflicted. Tbh just looks like a basic diode that needs to be replaced, but possibly it burnt due to overcurrent somewhere else? idk, seems like the shop you took it to was garbage.

 

I hope it was internal, and that is what the repair shop thought. The capacitor top looks opened up. They haven't gotten back to me in 3 days. I didn't call, I know it won't help.

 

I still didn't get my original ECM back from the local repair shop. I bought a rebuilt ECM from ProBuild on eBay. 1524. It's working great. I'll repost fuel economy. And any other info. My valve still need adjusting