Okay, I attached some pictures. Its very cramped under there. I found the main jet pump and traced the wires back to the spa kit. I don't understand why that pump seems to be wired into the Blower switch and why the Blower is wired into the Jets switch. It never used to operate like that so probably the guy that came out to try to fix it swapped it around to see if it was a switch problem. I guess that explains why the blower comes on when I push the jets button.
Anyway, I pulled the pump HOT lead off of Terminal B (see photo) and measured the voltage, weird, its only 6.5V with the switch in one position (not sure which) and about 4.5V with it in the other position. Terminal A (to the light) was hot with 120V so I moved the pump connector up to that Terminal but the jets still didn't come on. This leads me to believe the pump is bad, but still doesn't explain why I only get very low voltages at the other Terminal.
Any ideas?
Also, in the other labelled photo, what is that big silver thing that runs along the top of the spa pack? It had a wire lead that was not connected to anything.
Here's some pics of the spa pack itself: