Hello friend, it is very true that if there was a colleague who had already repaired this washing machine I had the circuit at hand I could tell you with certainty which of the two triacs is the one that controls the spin motor. For the rest of us, seeing the image of the circuit and being able to say what the spin triac is is almost impossible. I can help you in this way: look at the card on the other side, the side of the tracks and welds, and follow each of the lines that reach the pins or legs of each triac (in reality they are only 6 lines). The image I uploaded is that of a basic connection of a Triac along with a load (drying motor) and the starter circuit. with some variants this is the circuit used to connect the triac to any load, if you rely on this diagram you will realize that a triac is necessarily connected to the load to which it has to control, and on the other hand to a pole of the electric current. I think this will help you to find out which is the triac that controls the drying motor, if you have any questions, tell us.