For what it's worth , another theory on 45cat site:
https://www.45cat.com/record/k13568
jukebox george
7th Sep 2019
The 1966 Copyright filings are for How Can I Find The Way + On You Heart Ache Looks Good. BMI.com has the Composer names as Wayne Nathan Wadhams, Donald Edward Askew, and Kenny Karen
Ancestry.com does not have a Gavin Bernstein, lending credence to the comments below that the Producer credit is incorrect. This 45 is not mentioned in the pages of Carole Bayer Sager's memoir available on google books; the memoir has details on Sherry Harway. One comment suggests this duo were neighborhood friends of The Fifth Estate.
_________________________________________________________________________________________________________________
davie gordon
19th Apr 2018
I think you're right about "Gavin Bernstein" being two people, one of them being Kevin Gavin.
Gavin was the producer for The "D" Men, the original name for The
Fifth Estate. There's also a publishing connection as Waterview Music is credited on all The
"D" Men's records. Bernstein might be Herb Bernstein but I'm not certain, I'd guess there were
quite a few Bernsteins involved in the business. I'd bet Carol and Gerri is Carole Bayer Sager of Carol And Sherry with a new partner as Sherri Harway quit the business after getting married.
________________________________________________________________________________________________________________
jukebox george
19th Apr 2018
Prod. by Gavin Bernstein for Don Costa Prod., Inc. This seems to be the only credit for "Gavin Bernstein" so this might be two different names and the label is missing a hyphen in between. The songwriters are associated with The Fifth Estate and some of their earlier 45s are Produced by Kevin Gavin.