Writing a corrective action that actually closes
Most corrective actions describe what was fixed rather than why it happened, which is why the same finding returns. What a closeable action contains.

A finding is raised, someone writes "operator retrained, closed", and the same finding appears next cycle. This is the single most common weakness in otherwise functional management systems, and it is a writing problem as much as an analysis one.

Correction is not corrective action
Correction deals with the instance: the label was wrong, so the label was replaced. Corrective action deals with the cause: labels are generated from a list that nobody owns, so the list drifts. Both are needed. Recording only the first is what makes findings recur.
Get to a cause you can act on
Keep asking why until you reach something the organization controls. "The operator did not follow the procedure" is almost never the end of the chain. Why not? Was the procedure findable? Current? Written for the equipment actually installed? Was there time to follow it at that production rate? Was the person trained on this machine or a similar one?
Stop when the next answer would be about someone's character rather than about a system. Human error is a starting point for the analysis, not its conclusion.
What a closeable action contains
- The correction — what was done about the instance.
- The cause, stated as a system condition.
- The action that changes that condition, with a single named owner.
- A due date that reflects the work rather than the audit calendar.
- How effectiveness will be verified, and when — a date after the action, not on it.
Verification is the step that gets skipped
Closing on completion asks "did we do the thing?". Closing on effectiveness asks "did it work?" — and it can only be answered later, with evidence. Booking that check at the time the action is raised is what stops closure from becoming administrative.
Watch the pattern, not the item
Individually reasonable actions can still add up to a bad system. If most of them are training and reminders, the organization is treating cause as attention. Look at the register as a whole once a quarter and ask what it says about where the real weakness is.