Ok - I filled up the transmission fluid to the max level and took it for a spin. At first it seemed the same, then after some laps in my front yard the power seemed to come back a little bit more than before. But it still has issues - for example, if I "floor it" or depress the accelerator fully, it stops moving, and this same behavior occurs if I turn the mower up an incline.
I decided to pop the back of the mower off and take a video of the belt/fan that the accelerator controls. In this video I depress the accelerator pedal fully down and you'll notice it starts to lurch forward, then stops....the flywheel and belt stops turning and periodically jerks, and then smoke starts coming out from under the motor (smells like burning rubber). When I release the pedal, the flywheel and belt start turning quickly again:
Does this help troubleshoot the issue? Is this the belt jamming somehow? I'd just like to get feedback before ordering any parts given it will be a serious pain for me to do so from here.
Thanks.