Based on the sound of arcing, one of the elements failed. The upper one tested fine; too bad, as that's the easy one to access. The lower element on my Bosch induction range is accessible from the back, but only after you pry and bend a vertical piece of sheet metal down to a 30-40 degree angle. I assume this saves Bosch a few cents on each unit during production. Before bending that panel down, I remove all vertical obstructions: 240V power cable, the wires to the warming drawer element (spade terminal lugs), and temperature sensor (small white clip in the middle of the wiring harness). I also unscrewed the control board from the back and temporarily held it out of the way with some scrap wire running to the frame above. Behind that bent panel is where the element and a metal tray that is resting on top of dense fiber insulation. There is more insulation running down the back inside panel, and I pushed that upwards for visibility and access, and then found my element had welded itself to the metal tray. I pulled both out far enough to cut the weld loose with a Dremel tool (no amount of prying would break the weld). That tray has two notches on either side that fit around a flange on the oven cavity, so you have to use a tool to pry the tray downwards while sliding it out to get past that. After using the Dremel to remove more large welded debris from the tray, I inserted the new element. There are clips in the tray that secure the bottom rods of the element; make sure to lift the front rod over the rear clips when sliding it in. Then slide the tray back past that flange again, and with a helper holding the oven from sliding around, muscle the "access panel" back into something close to its original right angle bend. Have your helper screw one screw in at a time as you hold that piece in place so the holes line up. Then reconnect all wires and re-mount the control board. When testing to see if it worked, note that the oven makes all the clicks and whirs like it's working, but doesn't actually heat up the elements if the door is open. Just push the door switch plunger in and you'll quickly feel warmth (be careful, obviously; I felt more comfortable testing this way than probing the 240V terminals on the back). Support at AppliancePartsPros.com didn't have a service manual (I doubt Bosch lets those out) but did find a YouTube video that got me close. I have since posted my own video (still images with text) on YouTube if you want to see pictures; searching for HIIP055U lower element should get you there. Good luck; great oven otherwise, and another good experience with AppliancePartsPros.com.