Slow acting Mamiya 127 lens

I picked up a Mamiya 127mm lens in a camera package along with a 90mm, and the 127 has a little problem. The shutter speeds seem accurate, the aperature is snappy, but the shutter is slow to fire. Meaning, when it fires it's nice and snappy but about a half second after it's been tripped. The 90 is perfect so it isn't the body, and it even does it off the camera when tripping it manually with the pins behind the lens mount.

Any ideas???

The linkage is suffering from set up lube and it needs a CLA.

That's what I was hoping to hear John. Started taking it apart last night and the *#&^ing screwdriver tip broke off flush with one of the phillips head screws!!! I'll have to bring it to work (machine shop) and get it out but it certainly spoiled my night.

Anyone have a link to a service manual?