Restoration of fiber cut.

Dear friend!
Which of the following operations must be performed by maintenance engineers after a fiber cut occurs?
1. Check the sites affected by the fiber.
2. Check whether the protected service trail is switched normally and whether ASON rerouting occurs. If no switching is performed, the protected services are interrupted. In this case, you need to restart the protection protocol immediately.
3. After the fiber is restored, check whether the optical power is close to the reference value. If the optical power is far lower than the reference value, contact the line maintenance personnel to splice the fiber again.
4. After the optical power is normal, check the SDH or WDM performance of the line board to check whether bit errors occur. If bit errors occur, check the optical cable and the touched connector again (for example, the connector on the ODF).
5. Check whether services are normal. For a service whose protection attribute is revertive (The revertive attribute of the protection service can be revertive or non-revertive), check whether the trail is switched back to the original route (the default revertive switching time is 600s).
Thank you！