They are unrelated. Is the drain pipe leaking on the inside, like a clogged valve seal. Or leaking around the outside, like a cracked pipe or fitting that separated due to water in the pipe that froze? If you have not used the 12v water pump in a long time, the motor may just be stuck. But that still means pulling the pump and opening it up in order to turn the shaft. Pumps aren't that expensive, around $100, less if you order online. Might also be a blown fuse (which is pretty unlikely) or bad connection at the switch on the control panel or at the pump itself.
Larry Day, Texas Baptist Men volunteer
'13 Silverado LT 3500HD D/A CCSB 2wd, custom RKI bed
'11 Crossroads Cruiser 32MK loaded