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Great glad you got it going
The LED must be on the 3PDT pcb so I’m assuming you mean D1 on the 3PDT pcb and not the main pcb
It’s correct your LED anode long leg + goes to the middle and cathode – to non white boxed pad
You can check your LED is ok by using a coin cell battery if you’ve got one just stick it in the middle of the 2 legs
If your CLR and LED are mounted on the 3PDT pcb you can use your meter to check it gets power and ground, check from the 9v pad to the CLR and from the other end of the CLR to the LED anode for voltage and or continuity
If you DC jack power and ground go directly to the 3PDT pcb your faulty 9v pad shouldn’t make a difference