Tek 11402

I have a Tek 11402 to repair.
On powerup it spits out
j points acq G351 4
m L_11A52 L1831 2
n C_11A33 C1431 4

I don't think that these are the real faults except maybe the first.
I am told that it received a bump to get it to this state.

The unit doesn't seem to have a working time base.

Any ideas anyone?

Also does there exist schematics of the circuitry?

Andrew