Ok, job is done. Here is what I found:
When I pulled out the LNB, I indeed only had one coax attached to it. I guess the confusing part was that before this, I had an 18" round 2-LNB setup. I pulled four coaxes up to the roof in preparation for my move to the new dish. When the installer came out, he shoved all 4 into the LNB arm, even though he used only one.
I did find a slightly loose dish - the tech didn't do a good job of tightening everything down. From a couple heavy storms we've had in the past year, things shifted. The pole that the dish is mounted on (I have a universal chimney mount on my roof) had shifted slightly out of plumb, and the az/el lock bolts were not very tight. I have installed several dishes before, and have aligned/realigned as well. Once I got things peaked, I was good.
To give you an idea of what I had/where I'm at now:
101 was: 92-99, now: 96-100
99c was: 44-59, now: 91-95
103ca was: 27-46 (half were 0), now: 95-97
103cb was: 25-57, now: 91-97
SWM was: 92-100, now: 98-100
So quite a bit of improvement. When the tech first installed this, 99/103 was never better than about 75.
Couple questions, just out of curiousity:
1) I understand 101/99/103....what exactly is the SWM signal strength measuring?
2) on the 101, I have two odd transponders. 26 has always been 0, and 18 is a 73. I can't recall seeing anything on transponder 26 in years, but I don't remember 18 being so low. What's up with these two?
Again, thanks for all the answers.
Steve.