No boost - multiple short to ground dtc's

2001 TDI ALH manual

Anybody seen this before? I cleaned the ECU connectors with deoxit and the boost came back for a few days then stopped working.

Trouble codes:
P1441 - EGR vacuum regulator solenoid valve Open circuit/short circuit to ground
Intermittent
P1619 - Glow Plug Relay Open circuit/short circuit to ground
Intermittent
P1549 - Wastegate bypass regulator valve Open circuit/short circuit to ground
Intermittent
P1252 - Injection start valve Open circuit/short circuit to ground
Intermittent
P3105 - Intake manifold flap change-over valve Open circuit/short circuit to ground
static

No boost - multiple short to ground dtc's