On my '73 turbo, the gear always comes up just fine. Upon lowering it, the left gear always indicates "green" but the nose and right main gear may not indicate "green." A few pumps of the emergency handle always gets all three to indicate "green." The handle always pops back to the neutral position on the pre-flight check and while trying to lower them in flight. No problem with the flaps. The power pack was replaced about 5 years ago. Any ideas?