Vintage Synth Repair

Hi all,

I have a Moog opus but i'm not sure if something are failing, the 
test is :

BRASS section : VARIABLE position
MIX to VCF : middle position

Articulator Mode 2
Attack : 0
Release : 7 - 10

VCF  Decay : 0 - 10
Final Decay Swtich : ON

MIXER 

Chorus/Strings : OFF
ORGAN DIRECT : OFF
VCF (ORGAN, BRASS) : ON

This test is just to know if the Opus i have it's failing...

When you play some keys with high release (decay) at the articulator, 
and the VCF DECAY at ZERO position there's no RELEASE !, but if i 
turn up the VCF DECAY slider the RELEASE coming. My question is : 
Both Decays are linked ? Seems that the VCF DECAY are the MASTER 
DECAY.

The other problem is when i turn OFF the FINAL DECAY switch and start 
playing notes and retrigger other notes, the sound of the first notes 
still sound, so i hear a mess... I know that the ARTICULATOR MODE 2 
it's for summing notes, but is this is correct ?

Any one can help me to confirm ?

Best Regards,