I have a 1999 GCAA. The paint on the exposed tubes in the cabin has developed many fine cracks. Around a couple of the welds the paint has flaked off but the cracking and light rusting is evident along the length of tubes that frame the windscreen and the tube that crosses below the green house. The paint on the tubes in the tail cone and under the cowl look fine. Has anyone seen this on a new aircraft and any suggestions on how to deal with this? (The aircraft has always been hangered)