A4: Check Electrical Feed

With EM015 & EM010 disconnected:
Use an appropriate link lead to bridge EM010/016 & EM010/023 (to energize EMS control relay).
Measure the voltage between EM015/003 & EM010/022.

B+?

Yes
Go to A5 A5: Check Current Drawn

No
Go to B5 B5: Check For Short to B+