Footswitch or Phasor Repair for 112 RP65

Got my first MM, an 112 RP65. Sounds good, but the Phasor is not working. I didn't get a footswitch with it, and I'm not sure if a footswitch has to be plugged in in order for the Phasor to work. There are two RCA inputs right next to the reverb tank inputs, I'm assuming for the Reverb/Phasor on/off. If a switch is needed, will any standard two button Fender footswitch work, or do I need something different? The MM manual shows the Reverb / Phasor footswitch, it looks like a standard Fender footswitch.
If the Phasor should be working without the footswitch, where's the best place to start troubleshooting? It doesn't work at all right now.
Side note; this came with an EV Force 12 speaker in it, which I'm assuming is not stock?
Thanks!