I have a very long overdue-for-service Rolex 727 movement that the chrono has issues on. This movement has been stored in a safety dep. box and not touched since the early 80's. It is very clean, it winds and runs, but the chrono does not function. When the chrono is started, the balance wheel slowly comes to a stop. The barrel functions seem normal, and the chrono clutch mechanism engages normally with a click when the start button is pressed. When the chrono is stopped, the balance wheel movement immediately comes back. The seconds register on the face turns normally. The Chrono reset mechanism does not function. The reset simply will not 'push' with normal effort. The chrono reset brake pin by the barrel seems to be blocking the mechanism, and not releasing the reset function. If I very carefully move it a hair, I can push the reset, and the arms will engage the heart cams normally and resets everything to zero. What else goes on for the reset function? I do not know if it had issues when it was stored or not. My dad was a hobby enthusiast way back in the day. Rolex experts, could lack of service/lubrication have this movement so stiff that the chrono won't run at all? The start/stop functions are crisp and snappy. The stuck reset concerns me that it may have major issues. Thoughts?