[TowerTalk] T2X Tail Twister rotator freezes in place below 32 degrees ?

[Gary Marks]

My Tail Twister rotator freezes below 32 degrees but this rotator has been up for 30-years and it just started freezing in place last Winter. The parts breakdown does not show a seal that could be leaking due to wear and age. I do not know if there is a moisture drain hole in the housing of this rotator that could get plugged. 

Any suggestions on what the problem might be ? I can't be the first to experience this problem and yes I did check the archives.

THANKS ahead of time for your help.