The first copy

The five sentences below have been put in the wrong order.

1. The line was restored before a new proof was printed.
2. Ravi compared that proof with the approved text.
3. Once the second proof was checked, the full print run began.
4. He spotted a missing line on the second page.
5. The printer produced a single proof of the booklet.

Identify which sentence should come second and which should come third in the coherent account. Write both sentence numbers, labelled second and third.