My fiance was testing something a couple weeks ago. I remember it being a plug in outlet on a cord or something. I don't exactly remember what it was, but I do remember asking him if we could use that to test this because I've only ever used a multimeter on DC, & knew that my ex has some other tester that looks just like a plug that you put into an outlet to test AC current. We tried using the multimeter tonight to test an 18 v DeWalt drill battery to see which is the positive and negative terminals & the meter wasn't working right. I switched it over to check 1.5v batteries and it did nothing, showed zeros even after changing the batteries in the meter itself. Then I noticed a burnt component. I'm not any type of electrician, but I do know some things. I like to try to fix this if we can. I have some circuit boards from computers and was wondering if the component could be replaced with one from one of those. Plus I need to know what the component is. It's R27 on the board. Thanks.