If memory serves:
the ABS lamp, as you found
fast flashing turn signals (could be wrong about this)
poor performance as lamp housing/internal reflector(s) are not optimized for LED light design/output.
I think its safe to say that adding LED lamps generally turn out better than replacing with LED bulbs. Of course, YMMV, and some report they are quite happy with their conversion. There was a thread or three where some Gen 1 owners were looking at LED’s to gain back some amps to run other electrical items.
-Steve