ST290 GPS and NMEA issues

[smorast]

Hello,

This is my first go around with Raymarine instruments, so pardon any incorrect statements.

First, the system: ST290 (sail)/E125 integrated via SEATALK 1/2/hs/ng.

SEATALK2 devices:
3 pods (Wind/depth/speed)
Lifetag
2 digital displays
3 graphic displays
DPU
Keyboard

SEATALK1 devices:
Raystar 125 GPS antenna
Autopilot (ST290 control with S3 course computer)
2 analog wind displays
2 analog CH wind displays
NMEA Bridge
Seatalk1 to ng converter

SEATALKhs devices:
SR100 Sirius receiver
Laptop running RAYTECH (unable to connect to instruments)
E125 (not sure the hs network is working properly-no manual produced?)

SEATALKng devices:
E125
Seatalk1 to ng converter


Previous owner had an E125 installed using the ST1 to STng converter. All wind/speed/depth pod information displays on ST1/2/ng displays. I am able to see keyboard and each pod (all ST2) in E125 maintenance diagnostics. I am aware of the pinned thread relative to issues with this converter and potential issues, but not sure my issues are related as I disconnected the converter from ST1 network and problems persisted.

The problems:

1. ST290 graphic LAT/LONG displays ---. COG/SOG is displayed, so some GPS information is being passed from ST1 to ST2.
*Raystar has good view of sky and blinks green once/4 secs
2. I am also unable to see GPS position coming off of the DPU NMEA 0183 port.
3. Verified Raystar GPS is correct on E125 display and E125 NMEA 0183 output port, though True Wind Direction is NOT. Does the DPU output TWD/TWS?
*Should I be using the DPU NMEA output port, the NMEA bridge or install a multiplexer?
4. Two of the ST290 graphic displays in need of repair. Where can I obtain parts to repair myself-no longer repaired by Raymarine?
5. Where can I find a manual for the SThs switch/hub?

Appreciate any assistance and again, apologies up front for any incorrect statement due to being new to Raymarine instruments.