I've had a similar issue with my 1050 ... but I've been running in stereo mode driving a pair of M200's, so what's happening to me is either of the front channels will cut out - usually the left, although occasionally the right will go. I never tried (thought of) the "pressure" trick, although I have had my 1050 opened up many times over the years. However, I've found that increasing the volume will always bring it back.

I typically run at a volume of "28" or so. If I increase the volume to 40 or sometimes 50, the missing speaker will come back to life.

*Very* rarely I've had both cut out and at those times, I can tell that they're not totally dead, but that there's actually the sound IS there, it's just at a very, very low volume.

pat----