Yes, there are LEDs on the board for each heater output.
After running auto tuning, you need to save the parameters in one of two ways:
If you are not using config-override.g, then run M307 H1 to find the resulting parameters, and edit them into a M307 h1 command in config.g; If you are using config-override.g, send M500 to save the heater parameters in config-override.g.See also https://duet3d.dozuki.com/Wiki/Spurious_heater_faults_and_how_to_avoid_them.