Sorry i am a little heavy (try to understand)
No problem,so long you will understand .
I see you are a record Editor,7 edit´s on one Post
O.k, here we go:
I think the problem is about the NSL-32,so;
How could you sure if it is now same orientation as the other,without Dot and without measuring?About the lettering?The lettering isn´t an help for orientation,it could be printet other way as your other NSL.
Think of,you have 4 possibilitys to solder in this component. with lettering upside 2 possibilitys and with lettering downside 2 possibilitys !!
Here are some possibilitys to make sure of its right orientation and function:
Easiest way at all is to desolder and test with component tester of it´s orientation and if it was defect.
easiest way for you without component tester,is,if you are not to afraid,desolder both NSL-32,(on working and on non working pcb)
than try with the working Nsl,those orientation you now,on non working pcb,and vice versa.
Other way is t measure with Multimeter 1. where is Diode side?, with Multimeter Diode Test, 2. measuring of LDR side, if Diode side is correct connected,with engaged Pedal,but you had to know how
here is easy Signalway picture to go further with Audioprobe,if Signal passes through nsl:
read you later,must work now