On my Air Aces I just finished the following:
1. Installed all new drop targets from PBR
2. Installed all new springs
3. Installed new fiber links
4. Cleaned the entire unit including the coil sleeves and plungers. Works very smoothly
5. Installed new studs that attach the reset bar
6. Cleaned and gapped "Target Down" switch bank
Now it will reset fine between balls but not if you get all 9 knocked down within the same ball. It keeps cycling acting like it has not reset all targets. They will reset with the playfield partially lifted with the prop rod or with it in the vertical position.
Thank you in advance for any help.