Do you have a New Nintendo 3DS? Take extra care of it, as Nintendo can no longer accommodate repairs for these consoles. Find out more here.
Nintendo's Japanese customer service centre has announced that they are no longer able to repair "New Nintendo 3DS" consoles, effective immediately. This means that the New Nintendo 3DS system (KTR-001) is now out of warranty for repairs as parts required for repairs have run out. Despite the New 3DS being discontinued in 2017, it's commendable how long support has lasted.
Do you own a "New Nintendo 3DS"? Will you be effected by this news?
Pretty sure 99% of the problems that the NES had were due to the shitty cartridge connector. It's a very simple part and easy to replace. You can buy off-brand replacements now and fix it yourself. It's not that surprising that they had a ton of spare parts for that.
Yup, the 72-pin, after many years of use, would become loose and not make a full connection to the the cart. That's the most common issue. In general the NES is very easy to repair and there's extensive documentation out there for anyone with the knowhow to solder on a new part.