Your welcome. It probably won't indicate the amp is bad, mine didn't. Techstream may indicate the servo is bad when it's actually the amp.

When it faults if there is an approximate delay of 1 minute before your ac starts and the selected temp on the display resets to 75 those are both indicators the amp is bad.

When buying a used part on ebay I look for a seller parting out a wrecked car. You can click around and see their other items available to verify. I like it when they offer at least a 30 day return too. It seems like heat is what causes the ac amp to fail. I tried to source one from a cooler climate (east coast or up north) in hopes it would last longer. Most ebay sellers indicate where they ship from.