Stihl trigger assembly position of the trigger spring within the handle ?

SOURCE: poulan 3400 chainsaw throttle trigger

Its a missing or broken spring in the handle(trigger). If you look inside the handle you should see a circular spring around the post of the trigger. This spring returns trigger to idle position. If its missing or broken the trigger won't spring back.

SOURCE: husqvarna 365 order to install trigger, throttle catch and spring

Here's a link to the husky parts list.

http://www.usa.husqvarna.com/support_manual_search.aspx?webecsearch=10527&O=true

SOURCE: No pressure when pulling trigger, trigger sticks in handle body

if air sound comes out when you press trigger your pressure regulator pin is stuck-oil gun and attach hose repeate until pin frees or remove pin and clean with brake kleaN oil and replace

SOURCE: Husqvarna 136 chain brake handle spring.

You can get an IPL here:
HusqvarnaUSA.com
http://www.husqvarna.com/us/homeowner/support/download-manuals/
I don't think this has the detail you need.
If it were me I'd visit my friendly neighborhood Husky chainsaw seller (not Big Box Store) and ask to look at the clutch cover with the brake installed (take a camera). I'd probably ask for a quote for their repair too. HTH
Lou
Your model is no longer sold. The seller will know what model replaced it and may be willing to explain the repair procedure for your saw you. Take the cover and loose parts with you.

electronic & computer repair& servicre

• 12061 Answers
• Posted on Mar 26, 2010

SOURCE: stihl 009 chainsaw

http://www.ultimatehandyman.co.uk/manuals/stihl/19.pdf
manual above it is all in there..