2003 Saturn LW200 2.2 Ecotec starter issue

My DD is a 2003 Saturn LW200, 219K miles. Sometimes (not often), starter turns very slowly, then normal with retry. Mostly, starter works OK. Battery was replaced in 2020 and tests OK (Ancel BA301 tester), and in March 2021, I replaced the starter (ACDelco Gold 337-1026) – not too expensive & easy job, so I took a shot) – no change to this issue. If anyone has hints that a DIY’er can try, that would be appreciated.