[dacsman]

The very first Philco I repaired that had cap blocks in it had one with two 110pf caps that I thought certainly must be mica with that value... so I wisely left them alone.  And when completed the radio worked great.. well, for a little while then it developed this intermittent problem that I traced to.. guess who, the only caps in a block I didn't change.  When I pulled them out of the block I found they were paper not mica.  So in this case since you don't have a visual to confirm what they are... why take a chance.. change them out.