On the 1219, the single/multi lever must NOT be operated until the elevator slides have been cleaned and lubed, else you risk breaking the tabs on the RING, which is a NLA part. Also, the elevator uses a rubber spring (looks like a grommet) which usually gets hard and needs to be replaced.
The speed selector often sticks.
The rocker lever that turns the motor on and off often gets a sticky pivot bearing, which --when combined with a sticky speed selector assembly -- can cause the motor to stay ON even though the turntable is nominally off.
Original Dual audio cables suck. Also, the contacts in the headshell and headshell receptable just love to oxidize.
The tonearm clutch pad crumbles, causing the tonearm cycling to fail. The arm will not want to move over when you hit START, and it will not want to go back to the arm rest when the record is over.
The cuing uses high-viscosity silicone oil. This needs to be renewed every 10-20 years.
The manual cuing does not work -- as I recall -- in the MULTI position, but again, do not operate the single/multi lever until the elevator is serviced.
As noted above, the motor must be taken apart, cleaned, lubed, and reassembled. Not a task for the faint-hearted.
Best,
Fred