Four years ago we looked at the cost of repowering Hobo's SP135. Rebuilding was ~10K if we pulled and reinstalled the rebuilt. A new Lugger/Northern Lights was ~40K. Here's a thread discussing repowering the SP135. Take a look at Post #7 which goes into some detail. For us, if and when, we'll rebuild the SP135.
http://www.trawlerforum.com/forums/s...p135-2263.html