Describe the return
Say whether the unit was left powered and what happened during the first ordinary use. Keep the final water level and sound in the account.
Plan rather than provoke
Avoid repeated flushes if it does not clear. Suitable assessment should consider the actual model and route, with no promise that a cleaning product or reset will resolve the fault.
A useful distinction
A unit left isolated and one left operating have different histories. Include that distinction if known rather than assuming that a period away caused a blockage or that a restart proves it is clear.