I have a late 90’s Tonka Fire truck #36 with the motorized boom ladder that rotates and should lift and lower. The boom motor runs, but the boom does not lift/lower. These historically had problems with the inner gear wearing out from what I could find online.

Wondering if anyone has discovered a guide for dis-assembly and repair/ replacement of the gear components in the boom? I would love to get the boom fixed, but am cautious about damaging the working side rotation mechanism in the process.