A let on a second serve does not restore the first serve
The 2026 rules distinguish replaying a serve from replaying the whole point. An earlier fault does not disappear after a service let.
Rule 22 of tennis states that a service let does not cancel an earlier fault. If the first serve was already a fault and the second touches the net before landing in the correct service court, that second serve is repeated. Two attempts are not restored. This is a useful distinction when following a match or agreeing how to record a replay during training.
To remember the difference, you can make your own three-field sequence: attempt, incident and resumption. In this case it would be second serve, service let and second serve again. The record makes you describe what is being repeated instead of using the word let as though it always restarted everything from the beginning.
A different situation is a let that requires the whole point to be replayed: rule 23 provides for starting again with a first serve in that case. Appendix VI also permits the no-let alternative for a serve touching the net. Before applying a general explanation to a particular competition, check which format it uses.
This guide does not change the rules or adjudicate a recorded incident. When watching a video, separating what can be seen from what can be heard helps frame the question: contact with the net alone does not explain the entire decision. To consult the rule, look for its number and the edition of the document, rather than just an isolated sentence in a summary.