How far out of warranty are you? Before doing anything, you might as well try to get a goodwill repair from the dealer. Shouldn't cost you too much time, and there's no sense diving into this car's insides if you don't have to.
'15 i3 REX // Capparis // ZGW // ZTD // HK // 20"
20% Tint, Coding, LED High Beams/Signals, Painted Reflectors, MAX2 Hardwire
Past: F30 335i, E90 328xi