Let's hope that;s not the case, cause if any if them were changed, then the level of difficulty to align it is very VERY high, needing very special equipment and skills to get it right. sweep marker generator + oscilloscope and LOTS of time / experience.
https://www.youtube.com/watch?v=fHeWbyFMF8A
https://www.youtube.com/watch?v=I1h5zNFvn_U&t=212s
NOT easy
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