help: weird noise from mxr analog delay 118

[taku0319]

hello, today i played my vintage mxr analog delay, the green one.
it has been a while since i played last and this time stompbox appeared to be faulty.

there are some noise continuously and the delay time is shorter than before and the sound is distorted.
Please check below vid.

https://youtu.be/dbrqGw7A_SM

seems any parts are bad but i'm not good at delay electronics. really appreciate any suggestion.

schematic is below.
https://experimentalistsanonymous.com/diy/Schematics/Delay%20Echo%20and%20Samplers/MXR%20Analog%20Delay%202.png
appreciate any suggestion