As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INCOMPATIBILITY BETWEEN PARTS.IT HAS BEEN DISCOVERED THAT SEVERAL SUPPLIERS HAVE BEEN INFORMED THAT VOLTAGE REGULATORS LAMAR DGR 6 & ELECTROSYS VR600A ARE COMPATIBLE & INTERCHANGEABLE. IN ACTUALFACT LAMAR DGR6 IS INTERCHANGEABLE WITH THE ELECTROSYS VR600. NOTE: VR600 VOLTAGE REGULATORS ARE NO LONGER AVAILABLE. NOTE: ELECTROSYS VR600A HAS BUILT IN OVER-VOLTAGE PROTECTION CCT.WHEN INSTING ELECTROSYS VR600A FOR 1ST TIME, INST INSTRUCTION REQUI RE YOU TO COMPLETELY REMOVE OVER-VOLTAGE SWITCH P/N C593001-010 FROM A/C.