Canon 24-70 2.8L problem and question

The zoom mechanism of my 24-70 mm. f/2.8L got stuck which happened after I dropped my camera with the lens on it. The camera thankfully was undamaged, but the lens obviously needed fixing and also the front end got bent and so I brought it to a Manhattan shop and they did a so-so job. Months later I noticed that the zoom ring got rather tight among developing other problems so I brought it to the Canon Factory Repair in New Jersey. They fixed that and also changed the frontmost metal ring where you screw on the filter, the part the got bent and was straightened out at the Manhattan repair shop. Canon returned it to me four days later almost in mint condition and I was overjoyed because I love that lens and the $105 that I paid for the job was well worth it.

Now that’s a lengthy backgrounder to my suggestion for you to bring it only to the certified official Canon repair facility. I would have saved some $70 if I brought it to the Canon shop in the first place. Your lens obviously needs looking into at least; if there’s that screeching sound when I zoom my own lens it would bother me and I’d get it checked. My guess is that the special grease or something on the gears or capstans that make them turn smoothly might have been depleted, or maybe there’s a loose part in there that causes friction. Good luck.

Sorry about the delay, Max. Thank you for your advice.
Finally I returned it, I was about to buy it but I changed my mind. I will wait for a replacement and it should arrive in 15 days more or less.
You’ve been very kind, thank you again.

Take care,

Diego.

Problem solved, I bought a new one. Thank you for your time.