Roberts R727 low volume on am side

[Mike Watterson]

Check ... if RF (not LO) AM trimmer has been moved, I'd not touch the IF or LO alignment.

I'm not sure I understand the reason for ignoring the Local Oscillator coil - it is just as likely to have been interfered with as any other - and it is easy to reset using broadcast transmissions if an accurate signal generator is not to hand.

If the level is merely low, rather than stations off tune, there is no need to touch it. Also cores break easily, especially if one hasn't the right tools and experience freeing cores.
The OP didn't mention stations being off tune.
Yes, alignment using known stations is easy for the experienced.