Well, considering you didn't know why you bought, perhaps you should sell and take the 400% profit for the heck of it too then?
I utilize technical analysis to base most of my decisions. Looking at the chart it seems you made a great play,
TRBCQ.PK: Summary for TRIBUNE CO DEBS 29 - Yahoo! Finance
Might as well sell and walk away a happy camper, especially if you don't know where the stock is going to go from here.