Witton was always the terminus for the 39 as with the 3x tram. The only reason I can think of for the 39A turning round at Aston Park/Holte Hotel/Aston Church would be for Villa supporters leaving a game early because they were losing!! The only other place a 39 could turn around would have been at the clock at Aston Cross. Do you remember the 39 coming down Park Road hill past Ansells brewery, turning left in front of the clock then turning right onto a little piece of Lichfield Road up to the lights at Rocky Lane?