PRC Struts Not Rebounding

[font=medium-content-sans-serif-font, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif]I'm a newbie to the group, but with prior TC experience (see my new member introduction post). I have a 42k mike 88 that's experiencing an odd PRC issue. Even after 34+ years, PRC still functions. However, when in firm, at least one front strut (possibly both) don't rebound after compressing from bumps and/or braking. They remain compressed and then "pop" back up to correct ride height when PRC comes out of firm. When not in firm, the struts function as designed.  [/font][font=medium-content-sans-serif-font, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif]I'm c[/font][font=medium-content-sans-serif-font, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif]urious if anyone has experienced this and could provide suggestions or feedback. Thanks.[/font]

[font=medium-content-sans-serif-font, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif]SOFA[/font]

Just a wild guess....... the strut or struts have lost their high pressure gas charge over the last 35+ years. I replaced my PRC struts / shocks last summer with NOS ones I bought back in 2003. One of the old front struts I removed still had gas pressure and would quickly rebound to fully extended. Other front strut did nothing. I could fully extend it, fully compress it, etc and it just stayed in whatever position I put it in.