Bane of aged magnetic tape recovery is 'print though' due to long term static physical contact between layers.
Every storage medium has a long term problem whether scratches and erosion on the original smoked discs to modern solid state memory modules just losing their grip on data from the 10th year onwards as recently discovered.
There's a specialised lab in California that has a record for fighting domain theory and delving down more than ten layers of overwritten recordings on magnetic tape to get usable data. The experts who can help are out there with aged induced print though due to the huge effect it has had on entertainment archives.
Rob