A 28-year-old woman from rural Maharashtra presents to the primary health centre (PHC) for routine immunization counselling. She is 8 weeks pregnant and has no prior documentation of tetanus toxoid (TT) vaccination. The health worker informs her that she requires TT vaccination to prevent neonatal tetanus. However, the vaccine vial has been stored in a refrigerator that malfunctioned 3 days ago, and the temperature rose to 37°C for 8 hours before being discovered. The vial was then returned to 2–8°C storage. The health worker is unsure whether the vaccine is still safe to use. What is the most appropriate action regarding this vaccine vial?