The lever that locks/unlocks the latch from inside the house is broken. There's a Patent Number on the inside: US Patent 5125703 and underneath the Patent Number is D340398. 2265 is also stamped above the Patent Number
Tom from SWISCO responded:
August 20, 2020
Hello! If the only thing that broke is the lever, then you can use our 82-107 to repair your handle set. The video below may also be of some use to you.