What was noticeable for me was there wasn't an increase in frequency in the good indicators when one failed.
The front indicator unit had debonded due to the exhaust heat and similar to yours several of the leds failed prior to the whole unit failing.
On a positive note pairs of motorcycle type led indicators completed with stantions are readily available which in the long term will provide a better solution than Morgans original design.
The old style can shaped thermal flasher units relied on a specific current flowing through them, usually rated at 2 x 21 watt, to flash at correct interval. Because LED's draw virtually no current a different type of current independant flasher system has to be employed, which would explain your findings.
