ABC Network Color - not from some affiliates

[kfbkfb]

In the early days of Color Broadcasting in the USA (62-65),
some ABC affiliates were not able to pass through the ABC
Network Color Broadcasts.

I don't understand why.

According to RCA, realignment of the equipment at the local
station cost about $20,000 (probably verifying the phase
accuracy of the gear).

Anyone have more info about why some ABC affiliates
couldn't transmit ABC Color?

Kirk Bayne