The Check A should be conducted in accordance with the LAMS Schedule CAP 411. If you have never seen one, its is included with the aircraft airframe engine and propellor Log Books.
The LAMS schedule A check may not be exactly the same as the manufacturers Flight Manual/POH.
Failure to complete the Chek A invalidates the C of A and hence your insurance.
You should conduct the check in such a way that you are both safe and legal.