Nicely done! I have seen intermittent, temp sensitive trimmer caps, also oxidizes - sometimes Contact ReNu will revitalize the surface. Just to reiterate the obvious all the poles 21.4MHz and 3MHz are aligned to the exact same 21.4MHz center pass freq. If they are badly misaligned, it is usually easier to to do single pole (all other poles bypassed) first then go to the book procedure.
Good luck and great skill in the alignment.
Don Bitters
