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Most likely cause for this is an intermittent potentiometer. Check to see if any of them are mechanically loose as this is a sign that they have been damaged and could have cracked the wiper surface inside the pot causing this problem. Alternatively, any switch that controls any gain setting could also be intermittent or dirty. Gain of the amplifier should be stable, but is controlled by the feedback and signal injection at the pots so that is where to look first. Good luck, as intermittent problems are tricky, but sometimes better than no function at all which can be more costly.
First thing to ty is to try it using two 9 volt batteries as a test to see if lights work.
I ASSUME that you are NOT trying to use the pedal in the external effects loop (send and return) as the levels are not compatible. The pedal must be between the guitar and the inout of the amp.
Beyond this I would open the unit and look for something loose or broken where the blue LED is located.
The P803 is designed to work with the "Valvestate" and Tube amps. I don't think it is compatible with the Haze40 since they have an optional 4 button footswitch so the optional one would necessitate different interface than the P803.
It sounds like one of the filter capacitors is getting ready to fail in the power supply. Here is a link to some good info:http://www.geofex.com/ampdbug/ampdebug.htm Here is the schematic:http://www.ampix.org/displayimage.php?album=31&pos=112 Let me know if this helps.
When turning the knobs you might get a crackling noise if the amp is old, The knobs get worn. Either you can replace them or repair them with a tiny squirt of WD40. Check youtube videos for help.
As for the fading sound, That would be your valves ... They need to be replaced ... I suggest taking it to a repair dhop for that because they need to be matched.
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