Lenovo is pretty terrible with parts availability. It's not uncommon for parts for an enterprise-class, in warranty laptop to be unavailable/on a long lead time.
Dell is far better with parts availability, although (much as I personally don't like them), Apple is better than either.
> Lenovo is pretty terrible with parts availability
Really? That's too bad - I had to replace the fan on my Lenovo T500 some years back (~2011) and they had sent one overnight-by-10:30 (and it was pretty inexpensive, too). It certainly made an impression.
I guess back then IBM still ran the parts and service business, even though Lenovo had taken over the manufacturing and marketing several years before.
The one time that happened to me I called them and they upgraded the required parts for me FOC under warranty and shipped them over within 48 hours.
I've read stories on /r/thinkpad of it being a bit hit and miss sometimes, but they've been very good to me for the last 10 years or so. Far better than my experiences with Apple (not dealt with Dell).
Dell is far better with parts availability, although (much as I personally don't like them), Apple is better than either.