Employee was assisting 3 other employees lifting a DB box to release it from the chains that it was hanging on. EE felt a pain in EE's left bicep. EE continued to work all scheduled shifts. The pain in EE's arm did not get any better so EE saw a doctor on 4/20 when EE was diagnosed with a torn Bicep tendon that would need surgery to repair. Lost time as of 4/20/2022.