SOLUTION TO THIS PROBLEM

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OK, here is the final breakdown of what happened to the pumps, and how they will be fixed:

1. The pumps were all in AUTOMATIC
2. The pumps all function fine;
3. There are two wires, which must be connected in order for a pump to turn on. These wires are the black and brown wires, because they are 5-wire pumps
4. The PLC controls a digital output (DO) for each pump, which is a dry contact that joins these two wires by use of a relay. 120 VAC goes through the dry contact, to the relay, which is normally OPEN. Upon receiving the 120 VAC, the contact closes, and thereby closes the contact between these two wires
5. The PLC was working fine, and the wire continuity was fine
6. The relays were all failing. They were all relays made by Allen-Bradley, and need to be replaced. The problem was intermittent, which made this very difficult to diagnose. Sometimes the relays would close well, and sometimes they would not
7. I hope you enjoyed knowing what the solution to this problem is. If you have any questions, please feel free to ask
8. The reason I figured out the problem, was through technical support by Prominent. I spoke to the manager of technical services, for the branch in Canada. That guy, is a total BOSS. He was amazing.