Cynric,
i have had a bit of a look, so far i've come up with;
D1064 went into works 21/10/64, work carried out says modifications MB407/25-Fitting doors in bodyside for access to compressormotor brushes.
I'm now trying to find pics before entering works and leaving works at that time.
D1019 into works 14/8/63 and states having the same mod MB407/25
D1006 into works 2/9/64 " " " " " " ". Now that goes with the pic on page 10 as that was dated 8th march 64
D1055 into works 9/9/65 same mod carried out. MB407/89 mod done. (so both mods done at same visit to works)
D1018 into works 8/5/64 " " " "
Now i've just gone through some more works reports and have now come up with mod MB407/89- Fitting of hinges to access door in cabside and alterations to main steam pipe 'A' end. :scratch: this was dated 26/6/67.
I will look into this further but not sure which mod it is :scratch: