Use symptoms you can observe safely.
Describe water spilling at a corner, running over a length or escaping near a downpipe. Say when it happens and whether debris or plants are visible from the ground. Leaves and suitable accumulated material can obstruct the gutter, while a joint or damaged section may leak for another reason.
If the difficult area was left out of a previous clearance, mention that. Keep the difference between an inaccessible run and a cleared run in the history. Fallen roof debris in a gutter may be part of suitable clearance, but roof moss treatment and roof repairs are separate concerns.