1) The battery in my SP1.7 remote control is flat. How exactly is one supposed to change it? (Tried undoing the 4 screws in the base, but it still doesn't seem to want to open up).
2) Rather more importantly, one channel on my 9B-ST amplifier has just stopped working. There's no sound output, and the corresponding LED on front panel stays dark while the other four go red/green as normal when switching on. Before I start bugging PMC about it, is there anything I ought to check myself first?