FT-1000MP Headphone audio

[jjensen@VAX1.Mankato.MSUS.EDU (Joel Jensen)]

I've noticed that my MP's headphone audio seems awfully low. The AF Gain
has to be cranked to just about 3/4 of wide open to attain a normal
listening level.

 I've tried different headphones in both jacks...  I've increased both
trimmer pots to max.  Am I missing something obvious?  Is there some odd
specification with regards to headphones that I missed?

Any suggestions appreciated.  Thanks!