An SEC News Digest of 24 Jan 1974 (https://www.sec.gov/news/digest/1974/dig012474.pdf) came up as a Google image result for query 2 (see google-search notes). In Chrome the PDF opened, but reading it was refused ("Permission denied for reading page content on this domain"). A scripted download got an HTML block page. Web-fetch obtained the 8-page PDF, and its text layer (about 20 KB) was searched for "Gray", "Evgray", "Van Nuys", "engine" and "motor". No Gray item (the only near hits were Greyhound and Ford Motor Credit). The copy was deleted as irrelevant.
Google site:sec.gov "Gray Enterprises" OR "Edwin V. Gray" OR "Evgray": one unrelated hit.
Result: negative for these queries. SEC digests from the 1970s are scans and poorly indexed, so silence here is not evidence that no SEC action took place.
Next run
SEC News Digest and Litigation Releases for Jan-Apr 1976 (Lindemann: "March 1976 ... pleaded guilty to two minor SEC violations") and May-July 1975. Browse the digest index by date at https://www.sec.gov/news/digest/ and search each PDF for "Gray". Note: Lindemann's "SEC violations" may in fact be the California securities counts in the LA County case (the AP 1975 story: "three counts of a securities violation", filed by the DA). In that case the record is in LA Superior Court, not at the SEC.