Tell someone or document it before you close it up.
I find a bad S-and-drive joint above ceiling
Do not ignore it. If accessible, fix the mechanical joint and seal correctly. If access is blocked or rework affects other trades, document it and bring it to the foreman.
Do not let a bad joint disappear above ceiling. Fix it or document it before access gets worse.
Ask when the joint is inaccessible, already covered, affects dampers/access, or needs rework beyond simple correction.
Watch out
Do not bury a bad joint and hope nobody sees it.
Check
Take a photo
Mark the location
Ask whether to fix now or create a correction item
Steps
Identify what is wrong: open corner, loose drive, half-seated slip, missing sealant, sharp edge, or support issue.
Take photos.
Check whether ceiling/insulation/access is affected.
Fix if within your direction and ability.
Escalate before it becomes hidden work.
Say this to your foreman
In Rectangular Duct Assembly: S-and-Drive, I'm looking at: I find a bad S-and-drive joint above ceiling. What should I verify before I cut, drill, seal, cover, move, or install?