So for the last month, I've been running my MXR CAE401 clean boost at 18V. (The instructional manual says that this is TOTALLY fine, and allows for increased headroom). This weekend before a gig, poof. I get nothing. No lights, and when I switch the pedal ON, I get a drastic reduction in volume, and a very thin tinny sound. Any ideas what could have been fried inside? I'm very confident with soldering and working on PCBs. I'm going to open this sucker up tonight to take a look.