What about a re-calibration? There is no way anyone can change the RF shields and still say the cal is good.
You know or just believe?
I have repaired some of these SSA's RF units and know something how they act. Circuit design is good and it is not like crap hobbyist build hassle what drift wildly even if you jump on the floor. This construction is rock solid.
I do not know! I only believe and predict based my limited knowledge and some limited experience, it do not need new factory calibration table after this repair if it is done right. I keep this until some proofment with data that I'm wrong in this named case.
Of course, who ever do works inside SSA need know how to handle things in this SA. It is not at all everyman work, even when it looks quite simple. There is so many traps what may lead damage or drift or latent damage what will later become active failure (example EOS/ESD latent damages). Also board is mechanically very fragile. Also some filters on the board need care and all need keep clean. But handled right it do not drift with these parameters what are in calibration table. This machine is only up to 3GHz so it is not very difficult and critical.
Of course aluminium block dimensions must not change out from its dimensional tolerances.
If I change some mixer or example front end attenuator it need new calibration data table.
Totally other case is if equipment have valid official NIST traceable calibration certificate.
When the calibration laboratory set the seals and they are broken the calibration certificate is not valid anymore. It needs new cal certificate. (even if nothing is changed but still needs a new valid certificate.) This is done by making measurements in an approved calibration laboratory but typically not adjustments (exept if asked for example improve accuracy and paid or if some value have drifted over specs and if it can adjust. If not, then repair. If can not. Then to recycle or use without certificate for purposes what do not need cert added with warning label about situation)
So, if SA have fresh valid cal cert. It is perhaps wise to wait for this repair until the cal cert needs to be renewed. This avoids the extra cost since usually the official cal cert is not cheap.