Hitatchi M1CLXU-M chassis

[JMC!]

This chassis manufactured May 1974 with a serial number of 003000 has a vert foldover at top of screen.
The schematic available here is for the M1CLXU and appears to have a different set of components.
The vert IC has been changed as well as the few capacitors around the IC itself that appear to be associated with the vert section.
The foldover is present at turn on but gradually improves as it warms up.
Anyone have information?
Thanks.