I had a mold defect on the left fuselage of my new 1/72 Hobby Boss Jayhawk. Snapped a pic, sent it off to Trumpeter service : joanna@trumpeter-china.com
Couple weeks later I received a full replacement sprue:
No charge, no shipping costs. Wonderful service - I'm a customer for life!
EDIT: went to put the part away and realized the kit was Hobby Boss. I guess Trumpeter works with/owns Hobby Boss?