Many thanks to Holger once again. Just a while guess: I do not think that each of these symphonies was performed many times by the same orchestra, unfortunately, so there is some probability that this may be the recording from the world premičre, given on December 17, 1986 at Konserthuset in Stockholm. The conductor was Serge Baudo.
I would not endorse the statement that Pettersson is over-praised (to me, he is rather slowly being recognised as the major symphonist he is) but to the point, indeed there should be more commercial recordings of Eklund's symphonies, E. von Koch's... Incredibly, there is no commercial recording of Rosenberg's 1st or 7th (not even on LP), no modern one of his 5th, 8th, none of Hermanson's beyond the 1st, Y. Sköld's 1, 3 and 4 missing, etc. To be fair, Nordic countries are still better at defending their symphonic repertoire than many others, including France ::)
I have mixed emotions about Pettersson - IMHO, when he is good, he is magnificent - symphony 7, 8 and 9 and 2 in that order esp 7, are great as are his Concerti. When he is not good, he is brooding,wallowing, wailing and requires the proper mindset(to be kind). His later symphonies seem less inspired and written upon demand rather than inspiration and I have purchased them all.