Another possible part of the issue: at 8 yrs old, the bike is obsolete by manufacturers' standards. C'dale might not have and certainly is not obligated to keep that model year of frame in stock, at which point if they chose to honor a frame warranty, would ship out a later-model frame. Might or might not be the case that certain components won't just swap right over -- could very well be a different BB and/or headset standard. Who bears the cost of new, replacement headset and BB, both wear items?

My experience with those seeking warranty coverage is that they feel the manufacturer should be responsible for replacing these items; manufacturers think customer should be on the hook; shops get caught in the middle.