MARCONI 2955A FAIL SELF TEST

My Marconi 2955A has problems.
During self test procedure, it show problems on self test:
1.0 - error 11. FREQ 0 fails - High freq. (20Mhz)
2.0 - error 21. FREQ. 0 FAILS - LOW POWER
2.1 - error 24. FREQ 1 FAILS - HIGH POWER
2.2 - error 25. FREQ 2 FAILS - LOW POWER
2.3 - error 27. FREQ 3 FAILS - LOW POWER
3.2 - error 37. MOD. LEVEL FAILS - LOW