Very easy.
@Dredd Call them instead of emailing them. From what I am told you'll get nowhere with email but over the phone they're extremely helpful.
https://www.nintendo.co.uk/Support/Contact/Repairs/General-Customer-Service-1106617.html
Using them details? i will call later
Email was fine for me. I never had more than a 2 hour delay in their responses and they had the emails to look up when testing the issues I had rather than relying on hoping the person on the phone took detailed notes.
I will say that if you are having left joy con issues then you most likely have the Wifi/bluetooth module issue too as Switches without that issue don't tend to show left joy con issues on the non-repaired units. I had to send in my Switch after Nintendo repaired the joy cons as it was the internal wireless comms module that was causing the issue.
my wifi only showing 1 bar
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