Who was replaced in ACDC?

Could you please elaborate on the specific context and timeline in which the question "Who was replaced in ACDC?" arises? ACDC, or Australian rock band AC/DC, has had various lineup changes over the years, so without knowing the precise time frame or event being referenced, it's difficult to give a definitive answer. Are you asking about a specific era, such as the band's early days, their hiatus in the 90s, or more recent developments? Additionally, are you referring to a replacement in the band's lineup of musicians, or perhaps a managerial or production role? Clarifying these details would help me provide a more accurate and informative response.