Boeing released Alert Service Bulletin 747-53A2489 on November 26th.
This SB recommends visual inspection for doubler repairs in the aft lower fuselage area (typical tail strike area) and, if doublers are found, eddy curent inspection for scratches and cracks with subsequent repair depending on flight cycle number and extent of damage found.
The SB is applicable to all 747 models, including the -200B, -200C and -200F models.
´...will make shure that skin cracks or scratches that could cause skin cracks are found and repaired in the aft lower body skin. Fatigue cracks originating from unremoved damage that are not detected can affect the structural integrity of the airplane.´
´Existing maintenance program may not be sufficient for external doubler repairs that conceal unremoved damage.´
Seems the Boeing guys are really worried about the findings on China Airlines 611 wreakage, do they know much more than we do ?