The cable may be frayed or the lever/pedal may be damaged. What I suggest first is to remove the cable from the pedal. See pic 1. If the lever will then return, we know it is a cable issue. If it still fails to return, then it is the lever assembly.
As far as the clicking, that sounds like a relay. If you look at pic 2, it shows the relay block. You need to simply locate the box and then cause the clicking to occur. Place your fingers or hand on the relays and you will feel which one is causing the sound.
Let me know what you find.
Images (Click to enlarge)
Friday, December 6th, 2019 AT 8:35 PM