What country are you in. How did you pay for the item? May affect the detail of how you exercise your rights in relation to the store if you just .
Alternatively, contact Elektron and arrange a warranty repair. Though that might be more tiresome in terms of time and effort than just returning it for a refund/swap for a working one
Trig 3 in test menu , is the Red led on trig 5 defect.
4 green is working 5 blue also.
3 and 4 : combines is yellow but 5 is green
3 and 5: combined is purple but 5 is blue.
This device should be considered DOA. Most retailers have their own policy for items where a hardware defect appears within the first 30 days. Generally the store will replace the item for the customer and then they would seek reimbursement from the equipment manufacturer.
Assuming that the device was sold as new and that the retailer is also in Belgium then I would continue to pursue an exchange with them. If necessary, do a search and find out who owns the business and get in contact with them directly.
I hope that you’re able to get this taken care of.