40 CFR 1068.515 - How do I mark or label repaired engines/equipment?
(a) Attach a label to engines/equipment you repair under the remedial plan. At your discretion, you may label or mark engines/equipment you inspect but do not repair. Designate the specific recall campaign on the label.
(b) Make the label from a durable material suitable for its planned location. Make sure no one can remove the label without destroying or defacing it.
(d) We may waive or modify the labeling requirements if we determine they are overly burdensome.