I got this Antminer S7 used on eBay. I hooked it up and it was hashing at about 4TH for over a month, then one of the fans burnt out. I cleaned up the burn marks with alcohol and replaced the fan and ran it again and within a week the fan burnt out again.

Has anyone had this issue with the S7? Should I just relist it on eBay for parts?

Here's a pic of the burnt fan connector.
https://imgur.com/a/7LLac