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I have a Japanese assembled 1996 Toyota Corona Premio (AT211 automatic with
7A-FE engine) which is making a noise which appears to come from the top of
the steering column. The noise is associated with what I would describe as
a judder (most common when returning from a left hand turn).

Power steer fluid level is correct, belt is correctly adjusted (as far as I
can tell).

Any suggestion as to where to start or how to check/lubricate upper bearing