I would suggest starting with removing the pressure from the caliper by opening the bleeder and if the caliper releases then the caliper is most likely being held by fluid pressure rather then being seized.
However, if it is not releasing then the caliper is seized and requires replacement.
Below you will find the info on this depending on what the result is.
Please let us know if you have questions Thanks.
Monday, March 15th, 2021 AT 4:18 PM