The 0656 and 0726 are both formed from empties from Feltham Depot but all the 701s used in service have come from Wimbledon Park Depot, where the 0753 started its day so makes it a bit easier to switch it by the looks of it.
Looking at the schedule on RTT, that diagram seems to work as follows: 2Ux9 (down) and 2Ux6 (up)
5U09 0540 Wimbledon Pk - Waterloo (p21) arr 0626
2U09 0633 Waterloo -Windsor & Eton arr 0729
2U16 0753 Windsor & Eton -Waterloo (p23) arr 0853
2U19 0903 Waterloo -Windsor & Eton arr 0956
2U26 1023 Windsor & Eton - Waterloo (p21) arr 1119
2U29 1133 Waterloo -Windsor & Eton arr 1226
2U36 1253 Windsor & Eton - Waterloo (p20) arr 1349
2U39 1403 Waterloo -Windsor & Eton arr 1459
2U46 1523 Windsor & Eton - Waterloo (p22) arr 1619
2U49 1633 Waterloo -Windsor & Eton arr 1728
2U56 1753 Windsor & Eton - Waterloo (p22) arr 1849
2U59 1903 Waterloo -Windsor & Eton arr 1956
2U66 2023 Windsor & Eton - Waterloo (p24) arr 2119
5Y92 2128 Waterloo - Wimbledon Pk arr 2216
But three round trips would not end until 2pm, so not all in the peak.
Interesting to note that five trains could cover the entire Windsor Line timetable.
2Ux0/2Ux3
2Ux2/2Ux5
2ux4/2Ux7
2Ux6/2Ux9
2ux8/2Ux1
How many units have been used so far on the 2U9x diagram?