if the cable was broke it would go up even .. i know on ours there are two spokets with a chain drive the pin holdin the top gear broke and i had to go on the bottom of front edge of camper take out the self taping screws and reach up to get the gear out . just to find out i could have taken the front panel of the inside of camper and it was all there sittin in front of me .lol
on our bottom crank there is a lever that you turn to set the brake , on yours that might not be catching the gear maybe you could do like i did and get the inside panelling off and maybe see the problem better . just a thought for you ..
if a tree falls in the forest, and your at work how do you know it made noise.go campin more often you will hear it..