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Hi @lemak1234 . If the second light on FTTC box is red, it means the box is not sending power to the DPU under the footpath. After switching on, the light should be solid blue in a few minutes. Check or replace the phone cable from box to wall socket. If it is an old style wall socket, check that the wires inside are secure. No corrosion on the pins.
Is the wall socket that's being used the only one in the shop?
Does the phone cable go straight to DPU or might there be another connection in the middle?
If the second light is not a steady blue, there might be a problem with the box itself or the DPU.