I used to turn that type of work down as I couldn't safely reach it. I bought a 1989 bucket truck that once belonged to Verizon for doing this type of work. Got to a job this winter where I had to relamp a few 18 to 20 ft tall yd lights. Thought I'd better make sure the bucket went up and down before going to the top. Went up a few feet, wouldn't come down:). rotated it left, wouldn't go right:). Hopped out of the bucket and tried the solenoids manually and 2 of them were frozen stuck. Finally got them loosened up and it worked fine. This summer I've got to get the moisture out the system:)
