If the model listed for the dish (1000.4 WA) is correct, then the LNB would be DPP. It sounds like somebody hooked it up wrong, running two lines from the dish to the DP34 switch so it would pick up 110 and 119, leaving out 129. If the switch had been necessary (it wasn't, if there was only the one receiver hooked up) then there should have been three lines from the dish to the switch. Otherwise, it is best to leave the switch out of the mix.
You have a couple of options. First, if your system is not already grounded (or if it had been grounded through the switch) then you can replace the switch with a dual ground block and connect the ground wire to it. If you would prefer to run an all-new cable, then you would need to make sure it is RG6. You would still need a single ground block somewhere in the line between the dish and receiver, wherever you can easily ground it. At the back of the receiver, you would connect the one cable coming in to a separator, which has two short cables to connect to the inputs on the receiver. If you need a separator (looks like a splitter, but is designed to work with Dish DP signals to connect dual-tuner receivers such as yours) then I have a spare that I could send you.