As found, the shop light used as a local heat source for CP5's LLCV ("control valve" for John) was on, the valve stem pointer was 60% < pointer < 70% and the pump level was ~75% full as indicated by CDS and 30" WC as per the magnahelic diff pressure gauge (mechanical level) -> I opened the LLCV bypass valve 1/2 turn to manually fill CP5 while I troubleshot (reached > 100% full in 35 minutes).  I decided to fix the heat tape issue on this visit so we wouldn't need the light anymore.  The trace heat switch in the VEA was on but no 120VAC at the heat tape -> found tripped breaker (CKT #1 in panel VEAC-01A???).  I then confirmed 120VAC at the JCT box feeding the trace heat tapes - fixed (the breaker was likely tripped when the heat trace was installed a few years ago?)  Next, I removed the electric actuator cover and found a 1/2" of standing water in the bottom of the housing (not frozen).  One of the 24VDC wires had a crimp connector which was fully submerged.  Measured 3.9VDC at the terminal strip inside of the housing.  I noticed that the 1/2" plastic liquid-tight conduit elbow had been cross-threaded into the actuator housing such that it wasn't fully threaded and, as such, wasn't compressing the O-ring, i.e., was not making a water-tight seal -> I lifted the wires and removed and re-threaded this fitting (I should have tried to find a new one). I also followed Gerardo's lead and used electrical tape to seal all of the liquid-tight joints - Brrrrr.. cold fingers makes working with 18awg wires in tight spaces and electrical tape a humiliating task!  

Back in the "oh, so warm" VEA I found the blown fuse for XV300 terminal 212 and replaced it -> Confirmed 24VDC in actuator housing - fixed! I stroked the LLCV to 0% open via MANUAL mode in CDS (note, I had to come back to the Fuching Corner Station to do this because I couldn't navigate the Beckhoff screens!  Argh! I feel like a stranger in my own home.  No more changes/upgrades people!) and confirmed (back at the X-mid) that the valve stem pointer was at 0% etc.. 

Leaving in PID control