Hello Kevin
You know I have looked and looked at your schematic and felt that something was wrong but couldn't put my finger on it. Then the penny dropped: Q28 is a PMOSFET so the arrow on its schematic symbol should point outwards not inwards. This makes no difference to the circuit function though.
Can you explain the purpose of L20. I asume it's just high frequency filtering.
Data sheets for reference:
AO3401 PMOSFET data sheet:
http://www.aosmd.com/pdfs/datasheet/AO3401.pdf
MMBT3904 bipolar NPN transistor data sheet: **broken link removed**
PS: you have put your post inside the closing quote tag so it looks like it's part of ronsimpson's post. Just Lclick on 'edit'. Lclick on 'More Options' and move your text down and outsite the closing 'quote' tag. Lclick 'Save Changes'