FortiFlora probiotic for dogs has worked well for us in the past. Also as mentioned above rice mixed with plain chicken or a small amount of canned pumpkin. Good luck and hopefully it clears up soon.
Any advantages when it comes to foam or mud when bringing said piece of concrete back to level? I have a side walk sinking that butts up against the house foundation and am struggling to get someone to come to central part of the state and fix.
Have the same Timecutter MX series as OP and have had zero problems in the 6 years I've ran it. Has Kawasaki engine. Heavy duty fabricated deck and serviceable hydros are worth the extra.