Modern ThinkPads are still best-in-breed for that (the T-series, at any rate). They still come with full service manuals and individually available spare parts,

Modern ThinkPads are still best-in-breed for that (the T-series, at any rate). They still come with full service manuals and individually available spare parts, which can often be swapped between similar chassis. And the T480 is one of the last remaining holdouts against soldered-everything and razor-thin.