RX-1050 Power Switch problem

[Cushie]

Hi all. I'm having an annoying problem with the AC power switch on my RX-1050. It's a spring-loaded push button, and occassionally doesn't lock in the 'on' position. If I hold the button in all works fine - I hear the power supply relay fire, and then the speaker relay - but let it go and it pops right back out, shutting the unit off...

Are there any adjustments that can be made here, mechanical or otherwise, that might help solve this ?

Thanks in advance for any suggestions!

Rob.