Aloha,
My KX040-4 purchased new in 2019 just hit 1500 hours. Made the mistake of running it too slow, got code 29, limp mode, tech came out ($200/hr), did another regen, reset code, was ok for awhile but regen every 2-3 hours, then went back into derate. I took apart the DPF, soaked it in a DPF...