The location and timing help describe the problem.
Does water escape from a joint, spill along an edge or collect beside a downpipe? Does the same point behave differently after heavier rain? These observations can help identify which part needs attention. Safe photographs and notes are useful; standing beneath a gutter during a storm is not necessary.
Leaves, wet debris and roof fragments can gather inside channels or near outlets. Suitable accumulated material can be cleared. If a section looks loose, cracked or disconnected, report it separately. Cleaning a channel does not replace a damaged part, and a repair request should not be treated as a confirmed need merely because overflow occurs.