Hello all. About five months ago I got ahold of my dads old G5500 receiver that he said was broken and I did some basic cleaning and it worked great. Recently however, when I turn it on with either of my inputs I use, it waits about five or ten minutes before there is a click and sound comes out. When it has been on a while and I turn it off and back on, it only takes about fifteen seconds but this normally was a one to two second delay when I first started using it. I can do basic soldering and testing, it's the troubleshooting that I'm no good at. No idea where to start. This is much more complex than the '65 astrosonic I worked on before. Any advice would be greatly appreciated.