please help

I have an 73 General Electric cb Mobile weather cb radio that won't power on. I have tested almost everything but protection diode. Does anyone know where the protection diode is?

Up until maybe 6 months ago my pro-2096 picked up the Cleveland County/Shelby P25 system great, however, it stopped working (only receiving between 0-14 percent) and I thought there was something wrong with my scanner. I tried the Viper system and it sounds great still so I think the scanner is...