Diode identification
Ah... the good old data sheet not showing values or part numbers: -



Yes it is a problem when this happens and sometimes you've just got to figure it out the hard way. It's going to be a fast reverse recovery diode because Cboot is used to generate a dc voltage way above the 15 volt rail and this is being "tickled" at your PWM frequency. I've seen a lot of schottky diodes used here but seriously any fast recovery diode is going to be OK.

Possibly it's an S1 diode from vishay like this but reverse recovery is 1.8us and this strikes me a little long. Probably it's this from NXP - it does say in the data sheet that the marking is S1: -



Typically its reverse recovery time is sub 1us so it's probably OK.