I saw a fair few 142’s which had the new yellow doors on the original livery (025/026 in Chocolate and Cream and 050/065/066 in Provincial spring to mind as the last 5 units in the original livery).
Several 144’s also had the yellow doors applied to their original metro livery too. 011 springs immediately to mind but I know several more did. I know they had 2 piece from new but these were replaced with new doors and the updated control units. The conductor door control panel on the 144’s had a huge sprung cover flap from new, replaced with the current type common on all fleets after replacement. The main tell tale sign for this is they were also fitted with the circular emergency door release on the outside when done. Funnily enough 144017 initially had the original doors/panels still fitted after rebuild.
Newton Heath's 142027 was running in 1996 still in chocolate and cream with yellow new doors.
Were there problems with the original doors on 144s as they were replaced too?

