Identify movement between layers and fasten without damaging concealed services.
Sequence
Document the original condition, control immediate damage, correct the source, address affected layers and verify under the original trigger.
Do not skip verification
A repair is not complete merely because the surface looks better. Repeat the observation or measurement that originally revealed the problem.
Record for the house log
Save photos, dates, materials, contractor notes and any readings so recurrence can be recognized quickly.